I completely disagree. Not every product is made for every person. If you don't like it, use a different product. It's not like there aren't a plethora of desktop environments to choose from. There is obviously a sizeable portion of the desktop Linux market that finds GNOME to be a perfectly usable desktop environment.
Your comment is similar to asking why Tesla does not create cars with internal combustion engines.
The end result is that most users who are getting involved in Linux for the first time are making this choice long before they even know they are making this choice or being given an option simply by picking a random letter version of a distro like Xubuntu or Kubutnu or not having a letter at all and it being Ubuntu alone.
There are a few distros that have done it better and given the user a choice upon install to pick their DE. OpenSUSE has always done something like that from what I recall and I appreciate it a lot.
The real issue should be: Fedora/Debian/Ubuntu cater themselves to a very big audience and yet chose to set GNOME as the default
[1] Going off comments from one dev behind the Aeon distro on why it uses GNOME and not KDE, despite being an OpenSUSE spin-off.
yeah the ones who don't know how to change it.
These are large systems with their own ecosystems within them. When a project does this kind of thing it destroys a lot of the value that other developers are bringing for no gain.
Honestly, it appears as laziness sometimes like taking the easy route of keeping your verbose C codebase from growing more hair. Other developers are quite happy and accommodating to add experimental features gated behind a flag or option and still maintain a cohesive and polished experience.
The thing I like about KDE is that they adhere to the classic tried-and-true desktop experience while being ready and willing to accept that everyone has different preferences that they should accommodate. That is pragmatism, and that is treating your users with respect. (Whereas the GNOME philosophy is more, "our way or the highway.")