well first, it’d be optional like everything else in the titlebar. second, meta+left click and meta+right click for moving and resizing respectively. third, it doesn’t have to take up the whole titlebar, and most apps don’t have enough options for it to do that anyway.
@pretzel6666@c.im I know this isn’t entirely related to your post, but there was some stuff a while back trying to get LIMs (like unity) in KDE. maybe go and give these (https://bugs.kde.org/show_bug.cgi?id=375951, https://invent.kde.org/plasma/breeze/-/merge_requests/126/commits) some attention? If we can show that enough people want this kind of stuff, maybe it’ll get some attention from people who know how to implement it.