It's a false dichotomy to dislike OOP or prefer it. It's like saying I prefer hammers over screwdrivers. Just learn how the tools you have should be used and use them well.
The only app I'm currently maintaining and proud of[1] makes tons of use of "traditional" OOP. It uses lambdas and FP when necessary. I think it makes absolutely no use of JavaScript's dynamic features. I'm fairly sure this code would port easily to ObjC.
After 15-20 years, you just get bored of doing things in novel or "pure" ways, and do the bare minimum needed to get the job done that's in front of you.