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This is in fact my plan!If you want to run Curse of Strahd in A5E, you can do so.

This is in fact my plan!If you want to run Curse of Strahd in A5E, you can do so.
So that has two answers.
1. Yes, you can do all that. The basic goal was to allow you to run an O5E adventure using our rules.
2. Even if you couldn't the game would still be compatible with 5E. A DC 18 check and a DC 17 check are both compatible with 5E. Three goblins and two goblins are both compatible with 5E. There's no incompatibility there.
I guess different folks can define compatibility in different ways, but to us it means that you can use O5E stuff in our game (adventures, characters, monsters, etc.) If you want to run Curse of Strahd in A5E, you can do so. Our Thursday night game has us playing Tomb of Annihilation using A5E rules. It works just fine, except that the DM keeps saying how much he enjoys the new tools at his disposal.
But a new 5E rule is compatible with 5E. Otherwise no new D&D book would be compatible with D&D! You can change a 5E rule and keep it compatible with 5E.
Now, if you define compatibility differently, then only you can decide whether it's compatible. But that's our definition and what we mean when we say 'compatible'.
I'm not trying to be pedantic, but I can't think of a clearer way of explaining what we mean by compatibility than how I did. You got my bestest words there! I think I've made it clear that I believe it meshes very well and has done in both O5E adventures we ran with it.Agreed. I was looking for rough neghborhood - a DC 17 and DC 18 are similar. I was looking for things that had a big difference. If the standard DCs for Hard and higher difficulties needed to be moved up +5 because of skill inflation, or if we were moving out of bounded accuracy such that T3-4 characters can't use the same DC chart - that sort of thing.
I honestly believe you wouldn't put out a product if you didn't think it was great. Pardon me but I have some additional questions if it will fit my particular needs which is why I was getting more granular on compatible.
I have a table that likes 5e, isn't interested in learned other game systems, and if we introduce A5E it will be added to an existing O5e hardcover campaign and be playing right alongside existing O5E characters in a sort of "Super-expansion" sort of way. I was trying to find out how well it will mesh, including things like resource attrition as well as how close it is in the various pillars of play. I tried to make those questions broad for others who were looking for using both O5E and A5E material for their particular circumstances.
That's a bit inaccurate, as Level Up is, specifically, a different rule system. That's evidently by design. It's not an add-on, its a replacement for all the core rules. So yes, it is exactly like they use a different rule system, because they do. Level Up classes use the Level Up rule system, D&D classes use the D&D rule system.Trying to grok what you’re saying from what you bolded. Are you implying that 5E characters cannot be played alongside LU characters? Because that’s very clearly not true. We’ve been doing that since the playtests with no problems at all. It’s not like they use a differemt rules system. They’re just new classes. Like the artificer was.
No, again, there are lot of differences beyond those. A bunch of core feats work differently than the D&D feats they replace. A bunch of Level Up spells work different than the D&D spells they replace. A bunch of core rules work differently from the D&D rules they replace, like critical hits, Press the Attack as a universal combat option, the armor and weapon tables, and many, many more.AFAICT, literally the only major difference outside of how PCs are built is in exhaustion and strife instead of fatigue, and requiring havens to get rid of them.
If a new class or feat or a new spell means it's a different rule system, then every D&D book is a different rule system, because they all have new feats and spells and monsters and stuff.That's a bit inaccurate, as Level Up is, specifically, a different rule system. That's evidently by design. It's not an add-on, its a replacement for all the core rules. So yes, it is exactly like they use a different rule system, because they do. Level Up classes use the Level Up rule system, D&D classes use the D&D rule system.
No, again, there are lot of differences beyond those. A bunch of core feats work differently than the D&D feats they replace. A bunch of Level Up spells work different than the D&D spells they replace. A bunch of core rules work differently from the D&D rules they replace, like critical hits, Press the Attack as a universal combat option, the armor and weapon tables, and many, many more.
Different does not mean "bad" but it does mean "different." Replacing rules is different from adding on to rules. A game expansion adds new options, it doesn't change existing rules. A rule replacement is a new system. Level Up is a new system, a new game, that's compatible with the adventures of another game.
But those are not different in the sense you have to rewrite an adventure to use them.No, again, there are lot of differences beyond those. A bunch of core feats work differently than the D&D feats they replace. A bunch of Level Up spells work different than the D&D spells they replace. A bunch of core rules work differently from the D&D rules they replace, like critical hits, Press the Attack as a universal combat option, the armor and weapon tables, and many, many more.
Different does not mean "bad" but it does mean "different." Replacing rules is different from adding on to rules. A game expansion adds new options, it doesn't change existing rules. A rule replacement is a new system. Level Up is a new system, a new game, that's compatible with the adventures of another game.
Absolutely right, which is why it is compatible with "adventures" despite being a different system. It is not compatible with D&D classes, or D&D rules, because it is a different rule system that overwrites D&D.But those are not different in the sense you have to rewrite an adventure to use them.
No, that is inaccurate. Tasha's is a poor comparison - it adds to rules and options, it does not change core rules and remove existing options.If a new class or feat or a new spell means it's a different rule system, then every D&D book is a different rule system, because they all have new feats and spells and monsters and stuff.