doctorbadwolf
Heretic of The Seventh Circle
In that case, the game hasn’t been compatible with itself since the release of Xanathar’s.Where I different from Mistwell is that he seems to think that in order to be backwards compatible WotC will need to update all the feats, classes, subclasses, etc. from the 2014 rules. What I think is that if WotC updates everything that isn't compatible with 5.5, you aren't making the 2014 rules compatible with 5.5, you're converting those rules INTO 5.5. That's not backwards compatibility. To be backwards compatible, something has to be usable without special adaption or modification.
However, multiple people on the team said the phrase “every adventure and supplement”, and at least one emphasized it to make it clear that they do mean both adventures and supplements.I think it is pretty safe to say that "compatibility" means that you can grab one of the adventures and run it with little or no modification with the One D&D books, not that everything from 2014 will work seamlessly with One.
I mean sure, they could just be lying.