The fact you can make function like constructs in languages that don’t have them as a first class concept doesn’t mean functions are good for nothing. Likewise objects. If you can see benefits to making object like things in a different paradigm those still hold for paradigms that make objects a first class concept. If you’re asking why use a specific language with that concept over one you can implement similar concepts in then usually the argument is going to be about the ergonomics and expressivity of doing so. Similar arguments were had as functions/procedures crawled out of the primordial ASM soup.