Not true, Unix was designed to be simple.
Linux on the other hand got so much complexity added over the many years, I'd rather say it got further away from Unix than ever (even though Linux isn't actually Unix, it's Unix-like).
I can understand the kernel adding support for so much hardware that didn't even exist yet in the 1970s and 1980s, that's totally OK.

The problem is rather things like Snaps/Soypaks/PIP/NPM/Composer/Cargo/whatever, SoystemD, Apache (and now nginx too), PostgreSQL, Waycope, frameworks for programming languages, Gnome/KDE, and so many other stuff that get more and more crapware forced into Linux that unnecessarily add layers upon layers of complexity and an ever taller wall of abstraction between user and machine, no way I can even consider Linux to be Unix-like.

https://youtube.076.ne.jp/watch?v=KQumYOeN94I