It's not ONLY used on ultra high end guitars, just like I never said ONLY cheap guitars get poly. Lacquer is more labour intensive (more coats) and it takes more time. Time is money.Tell me, you seem to think its soooo great, maybe you could enlighten me. What is it that you think is soooo much better about lacquer than urethane that it is only used on, as you say it, the "ultra high end limited edition guitar".......
Listen everyone knows everything you posted about Urethane vs Laquer. It is harder, it doesn't fade. Yes everyone knows that.
I personaly think that when it comes to guitar finishes Lacquer looks better, feels better and sounds better. Thats it. I like the way it fades, I like checking on a guitar that is 30 years old. As for it being so fragile thats BS. It's not has hard as Urethane but it's more than durable enough for a musical intrument.
As for cars, well yes they are cars not musical intruments so paint them with whatever you want.
I wonder about other high end musical instruments. Have they started painting good violins with poly yet? Cello's? Pianos? I think a french polish job on a violin or piano would be at least as delicate as lacquer. Is that garbage too? The guy who spent 100s of hours on the finish probably thinks it's worth it.