Maybe two-odd decades is about the time it takes for enough people to have forgotten the reasons and decide to just remove Chesterton's Fence[0] because, despite the fact that screen area is at an all time high, we still need to squeeze more shit in around the edges.
I've already whinged about both scroll bars[1].
I'll also whinge about "dead space" rarity on UIs like DevOps and Jira. "No, i want out of all contexts! Did I accidentally switch that slider by clicking like 10cm to the right of it?" (actual example from within DevOps right now).
[0]: https://en.wikipedia.org/wiki/G._K._Chesterton#Chesterton's_...