I've said and proven its a bad and illogical rule for awhile now and have dismantled all the arguements on favour of the rule, but that does not diswade true believers in PHB +1 sadly.
I am sorry but this is somewhat of a strawman.Mearls and/or Crawford have stated multiple times that Core+1 is their design philosophy for 5E in general, not just as an AL rule. They have said they want people to feel that they do not HAVE to buy more than the PHB to keep up with other players and to have fun They do not want it to be like 3.X or PRPG where it feels like you have to buy 20 different books just to build a character that feels equal to other PCs.
To what end? It's been proven countless times that it is impossible to balance an ever-increasing list of options. Attempting such an impossible task would be a poor use of their limited resources.And it most definitely does not give WotC the green light to not design and test their stuff all together.
Are you sure of that? I've played in three campaigns, and none of them used any supplements. I feel like you would have been correct if you were talking about 3E or 4E, but I'm really not sure about 5E.The overwhelming majority of gamers use all crunch together, and not balancing subclass A in one supplement with feat B in another is wholly unacceptable.
Just stop it. Your persistent attempts to justify whatever WotC is doing with zero admission they could ever be wrong doesn't do your credibility any favors.To what end? It's been proven countless times that it is impossible to balance an ever-increasing list of options. Attempting such an impossible task would be a poor use of their limited resources.
You might be thinking of someone else. I'm the first one to admit that 5E is intrinsically flawed, because they simply didn't care, and the players deserve better from a company that's supposed to be professional.Why can't you still love 5E while admitting not everything about it is perfect? I know I can.
I've said and proven its a bad and illogical rule for awhile now and have dismantled all the arguements on favour of the rule, but that does not diswade true believers in PHB +1 sadly.

(Dungeons & Dragons)
Rulebook featuring "high magic" options, including a host of new spells.