It's called "beauty." If you don't have an eye for it, well, that's your taste. You aren't going to convince anyone with utilitarian arguments, any more than "those shoes are uncomfortable!" will convince anyone to wear sneakers instead of high heels or wingtips.

I've been to both Fallingwater and the Johnson Wax building. They're both beautiful.

> Many of those houses have required work as well

and the owners were quite happy to do that work. I don't think anyone hired FLW expecting to get a regular old tract house.