OP should check out Gnome Circle: https://circle.gnome.org The problem with why so many OSS/free software apps look bad can be demonstrated by the (still ongoing) backlash to Gnome 3+. It just gets exhausting defending every decision to death. Sometimes projects need the spine to say "no, we're not doing that."
GNOME 3+ developers put themselves in the inevitable (and unenviable) position of defending every decision to death because they limited the user's ability to make many, many decisions that were possible in previous versions . There's nothing wrong with an opinionated desktop environment or even an opinionated Linux distribution. But, prior to GNOME 3, the project was highly configurable. Now it is not. When people s…
Gnome 3 was a big update and adding options, which does happen, is not free. There were changes from Gnome 2 and 3 and adding some options "back" from Gnome 2 is really asking for that feature to be rewritten from scratch (not all the time, but a lot of the time).
That the Gnome team has different priorities from other DEs, one of them being "keep the design consistent and sustainable," is completely valid and preferred by many users like myself.