This design seems to cement the trend at Apple to position their products as consumer appliances, not platforms useful for development.
The problem is, there's nothing else out there. Everything is going to shit in one way or another. Windows is now a disaster, Linux was always a disaster in terms of user experience and isn't improving.
Mac OS was the last bastion of somewhat good, thoughtful design, user experience and attention to detail and now they've gone to shit too.
Curious: what have you tried? People who use "Linux" as a catch-all in terms of UX usually have only tried a single distribution with a single desktop environment.
Yup. You've just described a disaster. How many permutations of <hundreds of distros> x <dozens of DMs> must a user try before finding a good UX?
Hardly. The existence of a distro I don't like doesn't degrade my experience using a distro I do like. You may as well be upset at an ice cream shop for having dozens of flavors when you only like strawberry. Choose the one you like and ignore the ones you don't. It's not rocket science, even children can figure that out.