the biggest problem in FOSS today is the lack of separation of user and developer. FOSS developers by large expect everybody using their software to be able to make the changes they personally need on a developer level, and that is the reason why linux is not user-friendly
one of my favourites is how mozilla showcased a new color picker for firefox mobile back in 2013, finally letting us pick any value instead of being limited to a random preset selection that serves nobody. that functionality has yet to come, 8 years later. https://blog.mozilla.org/ux/2013/12/a-new-colour-picker-on-firefox-for-android/
and it won't be, until we solve that. bug trackers don't solve anything when you consider that there are bugs older than a lot of the teens on twitter today still open in mozilla's tracker because they simply aren't taken care of.