I thought this was going to talk about the struggle of sizing windows to arbitrary widths. I often try to keep slack and my email windows side by side and Mac OS seems to go out of its way these days to frustrate my efforts and maximize the one window or the other.
The resize corners grab area is also very frustrating though.
I've used Rectangle for years so I can arrange windows more quickly. Not good for arbitrary sizes, more for set positions.
https://rectangleapp.com/
I install Rectangle App on any mac I use. The keybinds are convenient and the auto-sizing/tiling is pleasant as can be.