WOW. The difference between these two statblocks is really striking. Never mind how much better the physical stats are for the Warrior Commander, Minsc 2014 has mental stats of 8, 6, and 10; Warrior Commander 2024 has 14, 16, and 14. I realize the latter's CR is three more, but come on. He's basically Captain America -- very literally superhuman.
I hear you, but a CR 10 enemy is not going to be the BBEG of any campaign, unless it's a really short campaign. I'm fine with legendary humanoids having stats of 20+, but I'm still not convinced the Warrior Commander is supposed to be legendary. King of the Dwarves having a STR higher than the PCs can obtain without a boon or relic? Sure. But this dude with less than half the CR of an ancient dragon? That feels really weird to me.
Maybe it's a necessary evil in order make this NPC sturdy enough to make saving throws, as others in this thread have suggested. That's an excellent point. But even a necessary evil is still an evil.