Have you looked at the parts shop? You absolutely can repair a Bambu printer, and as someone with a farm of the things can attest that it's no more complex than working on Prusa's. You still need to buy the parts from somewhere. Bambu's own pricing on parts is pretty reasonable in my opinion.

Bambu sells replacement parts for their printers. Very little of the printer is not repairable.

At some point the value proposition makes sense. People buy non repairable 2D printers all the time.

Also, as the other commenter noted, they actually are quite repairable. Bambu offers pretty much every part you could imagine and at prices that are extremely reasonable. Any wear component you’d expect is easy to replace.