This might be a stupid question, but since I've heard we're not supposed to use crib bumpers and blankets in the crib with babies, are most of the crib bedding sets a waste/useless?

Just ordered the crib and mattress and shocked by the cheap/ugly and/or REALLY expensive bedding sets! Do they use the bumpers and blankets later on (and if so, when?) OR are those things just to look cute in pics and when people come over? Wondering if most people just buy sheets?