What I wrote below that was 100% unequivocally true. (But you probably didn’t actually read it. You just like to disagree with me.)
Mythic Plus can also give you weapon, armor, and trinkets. It’s not just to supplement raiders who for some reason don’t want to see rings, cloaks, and necks drop from raids.
Raiding and Mythic Plus should each be their own complete gearing systems and shouldn’t be used to justify the flaws of the other.
Personal Loot accommodates any comp. Players should play whatever specs they enjoy.
And by the way, OP is talking about LFR, where you can’t help what comp you end up with.