The very reason I like Linux is for this diversity. I genuinely don't really get your point of view, which I actually see a lot, and which to me sounds like you want Windows or macOS, but somehow don't realise it.

Let's imagine this: some company makes an operating system based on Linux, in an efficient manner, by systematically choosing one way to solve a problem (one window manager, one init system, one file system, ...) and trying to meet the requirements of the mass to the detriment of freedom. It exists: it's called Android! Android is great, and it will eventually come to the Desktop for people who don't want Windows or macOS.

But fundamentally, what I call "Linux distributions" is not that. The whole point of Linux distributions, to me, is that even saying "GNU/Linux" doesn't work, because there are other userlands like "busybox/Linux"! Other init systems, other file systems, other windows managers, etc.

The cost of having a powerful core choosing "sane defaults" for the users (Windows, macOS, or similarly Android) is that it is very difficult to modify the system or even contribute to it. Look at e.g. GrapheneOS, an Android alternative (and which I use and love): it relies a lot on Google. Linux distributions are not like that: I can create my own Linux distribution as a weekend project.