Well, at least I haven’t had to replace the microwave in the Gulfstream .... Yet, anyway. :-)
I actually don’t mind replacing stuff like that, since it isn’t part of the original design / build, and it is just a matter of taking out the old one and plugging in the new one.
Yes we have found that most things are not hard to replace and so far I’ve ordered everything from Amazon except the micro wave. The water heater is about the only other thing we are concerned about. So far its fine. The furnace and AC work great but we hardly ever use them. We use a couple of electric heaters and we bought one of those portable air conditioners last summer. It cools the place down fine and pulls about 35% less watts and is pretty quiet.