It doesn’t? Because I think it’s easier to throw the cursor at the absolute corner of the screen and click rather than have to carefully select a button somewhere along the X axis. Just a thought, I’m a macOS user myself.
I've got an ultrawide and it doesn't require that at all; moving the start menu to the center to compensate for bad mouse speed settings is like reducing display resolution to compensate for bad text/icon size settings.
My eyes aren't good enough for that all the time, and sometimes, the cursor is hidden, so it doesn't even matter.
Getting to a corner has a predictable way to get there