On the benefits relative to XP and milestones, for organised play: since at least some AL groups have significantly fluctuating groups from session to session, milestones cause problems unless they are very small. If AL were to use the milestone suggestions in some Hardcovers, players who missed one session out of a chapter could miss the milestone (or, if the rule were that you had to attend for the whole chapter to get the milestone, would be bound to miss it). Checkpoints give equal character rewards for every time a player plays a character. This is also a benefit vs XP. Again, if a player attends session 1, with lots of interaction and exploration of the adventure set-up, but little combat, and misses session 2 when the group does all the fighting, their character could currently be well behind the rest of the party. So on balance I think this is the best advancement system for an OP campaign where players are likely to drop in and drop out.
I think it’s good we’re discussing this as it may be that identifying things which may or may not work well can help the Admins and Chris L implement a system which works. No-one is going to find a speed of advancement which works for every player as that’s a matter of preference (the PFS slow advancement option might be worth considering, but the structure of AL Adventures is different from PFS, I think, particularly now there’s more focus on the Hardcovers, and running a HC for a mixed group of slow and standard advancement characters would be a pain, I think).
Other things I like about the system are the de-prioritising of combat XP and the simplification of advancement which removes the need to calculate XP and reduces book keeping.
My preference would probably be for level 1 to be shorter than the others - I might even say that at Tier 1 you need as many Checkpoints as your current (or perhaps next) level to level up. Level 1 D&D characters are fragile, which doesn’t make for a great new player experience. (Pie in the sky preference: allow players to start characters at level 2, perhaps once they’ve had one AL character reach level 2, and allow new players to level up after their first session.)
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