First, the subclasses. WotC has been reprinting old subclasses with new shine, bringing them up to date with their modern design sensibilities. There weren't that many subclasses released in 2014 in the first place, and the ones released could have been given an appendix on "converting old subclasses" for those that started before Level 3.
I strongly disagree with this. I think there are 40 subclasses in the 2014 PHB and there are far more subclasses in later books which were written based on the 2014 rules.
To capture all these, the appendix on old subclasses would need to be larger than the part of the book on classes.
Next, the adventures of the game. The thing is, the UA versions of 2024 kept the core things necessary to use those old adventures: hit points, conditions, AC, Abilities, and Skills were all the same. Thus, it wouldn't have mattered if the game was redesigned to have Class Groups and Class Group Spell Lists, or if Bard could choose its spell list and Warlock its spellcasting ability; none of these things have any impact on using old adventures at all.
I don't think the examples here were very popular. The hypothesis seems to be that the Warlock can't choose its casting stat for some backwards compatibility reason, when I think it is actually that the reverse.
WOTC also made a purposeful effort in 2024 to heavily restrict Warlock, Paladin, Ranger and Sorcerer specific spells. The unique spells from these classes are effectively locked out of other classes, with the exception of a very few you can get from Fey Touched or Shadow Touched. Bard is most affected by this with the restrictions appying to magic secrets. While I can't say the decision to restrict Bard spells is popular or do to surveys, I can say it is purposeful and has nothing to do with backards compatibility.
lso, the math of the game changed, which means that 2024 characters are already overtuned for 2014 adventures in the first place. You can still run them relatively fine, but you'll have to either tune-up your stat blocks or put more effort into encounter design to match the stronger PCs.
This depends on the specific adventure. Characters are more powerful at high level, but some of the early adventures were really difficult for low level 2014 PCs.
The classic Goblin ambush in LMOP and Cragmaw Castle are better balanced for new PCs than they are for 2014 PCs.
Lastly, even though some people are mixing-and-matching, a lot of people are showing clear hesitation at using old materials with new materials. A lot of people are also talking about how they only want to use new materials, either because they are new or because they are better. So it sounds like a lot of people don't even benefit from backwards compatibility anyway.
The default rules on using old in a new game is that anything in the new rules replaces something with the same name in the old. That makes mixing and matching pretty easy and straightforward.
So no using the old Sleep spell or the old Great Weapon Master, but the old Cause Fear spell and Elven Accuracy feat are fine since they were not reprinted (yet).
We are mixing and matching in our games and having no problems. All of the games I am playing using the 2024 rules follow this template and it is not difficult at all.
In one of my games I am playing a Human Druken Master Monk 5/Scout 4/Wizard 1 and it is working fine, She uses the 2024 species, origin and class mechanics with the Monk and Rogue subclass abilities from XGE. She is rocking Booming Blade and Green Flame Blade off of TCE with 2024 Longstrider and Jump.
In another I am playing a Dragonborn Fey Wanderer 9/Glamour Bard 5/Monk 1. The only thing in her kit that comes from 2014 is the Dragonfear feat, she is using the 2024 Magic initiate Feat with Shield, Truestrike and Message.
IME pulling stuff from about 10 different sourcebooks (2014 PHB, XGE, SCAG, FTD, TCE, Bigby, ....) is a bigger hassle than the backward compatibility and we were already doing that before 2024.
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