Blender had an interface that was, to some people, very messy, but other very experienced, knowledgeable users fought tooth and claw to keep it - and ultimately

Blender had an interface that was, to some people, very messy, but other very experienced, knowledgeable users fought tooth and claw to keep it - and ultimately lost. The changes were performed, and, after a while, ~everyone was happy. These kinds of interfaces get some effort to get used to, and afterwards, you learn to love their quirks and don't want them to change. New ones get added / moved / removed organically through the life of the software, so the user and the UI change together. And all of that creates an emotional attachement.