I'm not sure why you're surprised. The macOS GUI has never been designed with power users in mind. If you wanted to enhance your experience as a power user, you always had to resort to 3rd party software. By using Apple products you accept to use them as they were designed to be used, and any customization of the experience is a luxury that could be taken away at any point. Apple knows best how you should use your computers, after all...

Linux is on the other side of that spectrum, but then you lose the benefit of a tightly integrated and curated ecosystem. If you're willing to give that up, and don't mind tinkering and frequently dealing with jank, then Linux might be for you.