If you buy some of those cheap knock-off props you almost can't balance them.
I'm a fan of balancing. The higher the KV/RPM the more important it becomes. They should at LEAST be checked for 'reasonable' balance.....since some come really out of whack.
Like battery care, some of it is safety, some of it is what kind of hassle vs. reward you are willing to put up with, or find acceptable.
You don't want to, don't, it's your plane.