Whether you agree with Keith or not, I think he makes some objectively good points. Maybe I'd even say undeniable points. Now that he's pointed it out, I too am bothered that the Warrior Commander has Str 21, Dex 20, and Con 18. That's a statline suitable for Conan the Barbarian, not a nameless DC 10 rando.
I'm saying that as someone who likes 2024e as a whole, and likes the new MM enough to use the monsters in his otherwise 2014 game. That can be true and I can be troubled by the way the stats have gone off the rails. I'm certainly not ready to chuck the new edition the way Keith might be; I love the new monk too much to do that. But one can appreciate what the new edition fixed and improved while still regretting the things that got worse.