And sure, maybe the point was that if standard window managers did support it, it would be gratis.
But the fact is they don’t. This is a pretty niche feature request, bringing back behaviour that was roundly mocked in the original Mac OS where it comes from. (e.g. Joel Spolsky https://www.joelonsoftware.com/2001/10/24/user-interface-design-for-programmers/#:~:text=Sit%20down%20at%20a%20Macintosh – Front and Center at least fixes the bug where clicking a window brought its application forward, but not the window itself)