That's a bonkers way of looking at it because the gm uses more of that book than any one player at their table & needs to use the rules and challenges the PCs that come from that PHB. Your point would only be true if d&d were some kind of extreme asymmetrical game where the gm was playing a totally different game with totally different rules that the players somehow never interacted with.To be fair, this is a player's handbook. So it being aimed at players over DMs makes sense.
Now, if the new DMG doesn't do for DMs what this book does for players, and therefore the PHB winds up having to also do the heavy lifting for DM support, then we'd have a problem. But we haven't seen the new DMG yet.
What I don't understand are complaints about power creep. Feels like antagonistic "DM vs PCs" mentality to me. It doesn't matter how much power creep the PCs get, the DM can ALWAYS win without even trying. The real question for DMs is whether combats are easier or harder to balance now, and they are objectively easier to balance now that sustained damage is buffed but nova damage has been nerfed (notable exception of Conjure Minor Elementals needing each DM to determine their homebrew nerf)
It matters because we don't have the books to fill in the other side of that equation and the phb didn't really redo rest or the mechanics that make PC's far more durable than stuff like trolls. Toss in the your going to love this but your gm is going to hate it style statements from wotc or "it's a player's book" from the community and it becomes even more reasonable to bring them up.
Those complaints can be summed up in what one of my players said a couple fights into the condition lock weapon juggling clown show most of a 5 player group was putting on when they admitted "I'm bored to tears here, it's like using too many cheat codes in a video game and losing the fun...".I also can't comprehend all the complaints about increased complexity for Martial classes. For decades everyone has complained about the Martial/Caster divide, then WotC actually tries to do something about it and people complain about it. Increased complexity for martial classes is an awesome thing for the game.
My personal thoughts on the new phb? Dunno yet for reasons stated above and by others. I can't really form an opinion for a year or two when the other core books are out because none of them function in isolation. By then I expect that the bar of expectations will be raised by upcoming Alternatives and the phb alone seems to have come with a shovel that starts it in a hole.
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