you'd think a lot more of these demons and devils and whatnot would know how to cast dispel magic, a level 3 spell.
That's another different can of worm entirely. Since they are overstatted and their HD increased, had they access to such HD based abilities your life would be
really unfair. Instead, they rely on off the chart SR to protect themselves from your abundant casting and favoured metamagic. Basically, since there's no AI competent enough to play D&D, we play who gets to roll bigger numbers.
It's not exactly fun but I don't think it's something that Owlcat can singlehandedly solve. AI in gaming is a pretty sore topic, for those that noticed...