As time goes on and environments get more and more mixed, this will be insanely confusing and borderline untenable in large environments with many complex GPOs. We already have enough things to worry about between testing patches for Microsoft (see January updates), researching and mitigating a never-ending flood of vulnerabilities, etc.
What possible explanation could there be to not have one set of templates, and Win11-exclusive settings simply having a Requirement of "Windows 11". You know, exactly how Windows 10 was handled? If there's conflicts, move older settings to a "Legacy Settings" subfolder, exactly like was done with Windows Updates' settings in recent ADMX templates.
This is a tone-deaf decision that I think Microsoft should reconsider.