That’s emphatically not what happens everywhere. It might be what happens everywhere people use a single Latin layout, but if you use two layouts or more you definitely want things to stay on the same physical key regardless of any switching—your muscle memory is bound to hate you otherwise.

For example, I expect CUA cut to be Ctrl-X (QWERTY), but also Ctrl-Ч and Ctrl-ז. This is how it works on all graphical desktops I’ve used and also, with some work, in Vim. (Not in Kakoune, though, which is a substantial annoyance.)