Because Gnome is RedHat and ...

1) Because RedHat is one of the few companies that puts sustained, long-term funding beind developers working on Linux. As such, they get an outsized say in what goes on because they are doing the work. If you would rather that Linux go a different direction, fund a bunch of programmers and take it that way.

2) RedHat put in the work, time, and money to get certified in ways that allows it to be used for big business. That means adhering to things like accessibility, auditing, etc. If you get the same certifications, big business accounts can use your stuff instead.

If you want people to ignore Gnome, all you have to do is fund a bunch of Linux developers to do all the work they are doing. Easy peasy.

Of course issues still get stalled on this, because it takes a while to figure out that the disagreement is to fundamental. Often a compromise is actually found in the end.