On many Linux desktop environments it is the default - or can be configured: To hold the Windows Key ('meta') and left-mouse-drag a window around from _anywhere inside the window_! No need to get the mouse into the 'title bar'!

Additionally, meta+middle-mouse-drag allows one to resize a window from anywhere in the whole window!! (it chooses the closest corner when the drag starts) and this, being able to resize a window without needing to put the mouse in a usually-very-thin window border, is extremely liberating in my opinion! To the point where I really miss it on sub-windows where the app is handling resizing/etc itself!

There's a Windows app I used to use that supports the same kind of thing for Windows (different key I think), no idea if there's one for Mac I'm afraid - or whether it can be configured to work that way, but there probably is one so it would be worth investigating if this sounds useful to you I'd say!

To be fair that's one more corner than Tahoe.