Continuing on the "But what about UA?", I think one of the big flaws of 5e, at least when it comes to official published content, is the lack of class options, ESPECIALLY when it comes to using only the PHB. Some classes lack interesting choices (Dragon blooded sorcerer just seems boring), others are mechanically broken (Beastmaster Rangers) and some just seem like there should be way more options (Bards).
Part of me that really needs something outside of the standard PHB/SCAG in my own 5e games, is because it doesn't really make my character mechanically diverse to other characters. Yeah my character could REALLY be focused into herbs or whatnot... but he still also has to weave magic or beat people over the head with a sword? I don't expect everyone to love homebrew (even if WotC push it with dmsguild), but It'd be nice if Adam at least perused other WotC sources (Don't remember hearing a mention of any Sword Coast Adventurers' Guide during any character creation) so there would be more options available.
The flip side of course though is even the main cast of the show has trouble with remembering stuff in the PHB, so maybe it's just better to not throw a stack of UA PDFs at them and confuse them even more.
This turned into a bit of a rant..