Powder coating is popular on motorcycle projects for a few reasons imho. 1. Convenience, You can strip a bike down to a bare frame, bundle the frame, cycle parts etc into the boot of the car and drop it all off at the local blasters/powder coaters. Pop back a few days or a week later and pick it all up and job done. So no paint stripping, wire brushing, having paint overspray all over the shed , parts hanging out of bits of wire all over the place.
2. Its relatively cheap, good quality paint is expensive and the new 2k paint is dangerous to your health.
But for me i'll never use powder coating again, a few years ago i had my triumph frame and cycle parts grit blasted and powder coated by a place everyone was raving about. "Its so tough", "You'll never need to have it done again". But despite the job being only a few years old , the rust is working away merrily under this fabled super tough powder coat and its falling off in chunks. This means i'll have to strip the machine again and do the job PROPERLY this time.
My A10 was up on the bench being rebuilt having been powder coated by the same place, it never seen the road since i bought it, and already the rust was having a field day under this crap.