I actually wish macOS would clone Alt-dragging from anywhere to drag and Alt-right clicking to resize from anywhere from Linux (at least GNOME and KDE Plasma have this built-in). That would certainly solve most of the complaints in the original post.
macOS has Cmd + Ctrl + drag to move windows. Alt + drag seems unlikely given that it's already often used for "copy" actions.
I just tried that on Tahoe (26.2) and it didn't drag the window with Ctrl+Cmd+drag. Is it supposed to work on all windows?
Oddly, the one thing it doesn't work on for me is the main area of the System Preferences window. Everything else I've tried seems to work, though.