i think its bc a lot of pretentious ppl who wanna seem smarter than they are do that. but i would say a lot of ppl rlly do just have big vocabularies. like i dont do it on purpose but sometimes it flows better to use a word i know thats exactly what i mean than using filler words like “like” or “kinda” and risk being misunderstood. i get wym but its just a default sometimes