So let's say I've never played D&D before, but after watching Stranger Things, checking out Critical Role, and talking to my friends, I've decided to take the plunge, purchase some books, and get to playing. I walk into my local Barnes & Noble and I see the holy trinity of D&D books, The Player's Handbook, the Dungeon Master's Guide, and the Monster Manual, and I go ahead and purchase all three because I'm a masochist and DMing seems like its right up my ally. (Alternatively I'm a sadist and I wish to make my players suffer.) I've got an introductory adventure I'd like to run, and I invite a few of my friends over to play, some of whom have been playing D&D for a few years. What shows up to my table? Well, I've got an Artificer and a Celestial Warlock. Okay, I guess. And don't the stats on the Halfling fighter seen a little wonky? Since when did they get a bonus to strength?
I don't really care if we call it a new edition or what, but I'd like the rules codified in one set of books. If we're going to go with Tasha's when it comes to race in the future, then put that in the PHB. This might not be a big deal to those of of us who have been playing for a while, but this kind of thing will frustrate new players.