epithet
Explorer
Too bad some of you don't get that these rules aren't written for your benefit.
Just like aarakocra being disallowed isn't about you.
These rules for AL are written for new player and new DM's. Not for the folks that have been playing for years. Perhaps the biggest driver of the success of 5E (and the continues sales of new PHBs) is accessibility to new people. And a big part of that is keep organized play accessible to those same potential new customers.
PHB+1 is simple, it's understandable, it accessible to new players and new DM's. Exceptions are not. Complexity is not.
So if I show up with my AD&D books and some 30 year old characters, I can use all the published 5e material? Awesome! Glad to know that being a grognard comes with perks.