Yeah if the settings panel had feature parity with control panel but with a better user experience nobody would mind but it's less features AND a worse experience.
I remember trying to change some mouse settings on windows 10 but they removed the ability to get to the old mouse options from the desktop. I drilled down through the settings app and eventually buried deep I found where it would let me open up that same old mouse settings modal to get to what I wanted to change. More clicks, more searching, and less features = poor user experience
And it's also a way for topic focused servers to filter out signups as well. There are general purpose instances with open sign ups that don't do that.