Take this for example:
https://movq.de/v/8822afccf0/a.png
I’m talking about this area specifically:
https://movq.de/v/8822afccf0/a%2Dhigh.png
One UI element ends and the other one begins – no “transition” between them.
The style of old UIs like these two is deeply ingrained into my brain:
https://movq.de/v/8822afccf0/b.png
https://movq.de/v/8822afccf0/c.png
When all these little elements (borders, handles, even just simple lines, …) are no longer present, then the program looks buggy and broken to me. And I’m not sure if I’ll ever be able to un-learn that.