@npro Look what happens when you move the tab bar from top to left. The Address Bar moves up into the Title Bar.
One button could toggle Top/Left but there are four positions, so one needs a four-way toggle or a drop list.
This is just not ergonomic.
There are a lot of shortcuts and mouse gestures. I am sure that most users forget which one does what. The truth is, if you don‘t use a shortcut frequently, you forget what it is, even if it is carefully selected to be mnemonic, e.g. Ctrl+Shift+T and Ctrl+Shift+L, (Ctrl+Shift+R and Ctrl+Shift+B).
I am with @mib2berlin here; it probably won‘t get done because there are several easy workarounds, but I have been wrong before.