Not that you're wrong, but IMO the moving and resizing complaints are resolved by the Ubuntu behavior of (IIRC) alt-leftclick-drag and alt-middleclick-drag. It completely eliminates the need to find any special target within the window: just click anywhere inside it.
That's just the top of another iceberg: features are increasingly harder to discover.
I use i3wm, which is a tiling WM. There's no window borders, so this resizing feature (W-leftclick and W-rightclick) has been there for many years, alongside a keyboard-only way to move or resize. That's hard to find unless you read the documentation, but that's alright, because the target user is supposed to be a power user.
But how are casual users of Windows or Gnome supposed to resize a no-tile window? Or to find a feature with no visual clue? I've had this problem myself on web sites where I can't guess where the links/buttons are, or with phone apps where I have to try several gestures until one of them does what I wanted.
This X11 (probably also in Wayland) feature Meta+mousebutton for resize, move, etc. has been there for the last 30 years or something. Yet it is not widely known, so let's be honest, it IS hard to discover. It can't be a justificiation for destroying the UI, esp. window borders.
