[uKVZe85V]

You're defeating your own point. CSD in practice breaks a basic feature of the desktop : knowing at first glance which of the windows will receive whatever you type on the keyboard.

For eons the standard was: the only one with the title bar showing the theme accent color. That is consistent, predictable, keeps the user in the flow.

With CSD each app does whatever inconsistent thing they can fancy. You type and oops deleted something in the wrong window.

Alas now even many default SSD setups fail at this (selected and non-selected windows look pretty much the same) and keyboard-first workflow is much hindered.