Yes it is a weak point. In the end, no matter what you choose you'll have to make a compromise. Some people prefer extra stability, others prefer a specific workflow or UI theme. It's entirely up to you and that's what makes Linux so great!

My experience has been that while gnome extensions can break with updates. KDE’s built in customization is already buggy as hell. So your choice is to either use gnome for a generally good experience and disable extensions when something breaks, or use kde and not know what feature will break what.

Gnome team probably made the (correct) choice that they couldn’t reasonably maintain a massively customizable de with their resources.