I do this, legitimately -- but with a very specific application: Firefox. On Windows, I can get firefox top border to a VERY small amount. But for some reason, in the past -- every Linux distro I found, when Firefox is maximized, I still get an additional window decoration on the top, above the browser tabs. My Firefox bar on Windows only takes up 64 pixels of height.
For those that like firefox drawing its titlebar instead of using the system one (I can those psychopaths) it's literally a right click on some part of the ui, customize and at bottom there's an option about which titlebar to use.
I mean, at least I CAN fix this stuff in Linux. Plenty of instances like this in Windows where I'd just be stuck. I really need the FreeCAD team to get their shit together before I can truly swap over.