It sucks if you're non-technical too, it's just harder for non-technical users to figure out the underlying source of any problems they have.
v6 also has better measured performance on webpage load times. Perhaps "pages load slightly slower than they could do" isn't a show-stopping problem, but faster would still be better, right?
CGNAT specifically means you can't have even temporary peer-to-peer connections, e.g. non-server multiplayer games generally won't work. And forget about trying to host anything, dynamic DNS services can't help you here. That to me is a much bigger problem than IPv4 in general being a bit slower.
v6 also has better measured performance on webpage load times. Perhaps "pages load slightly slower than they could do" isn't a show-stopping problem, but faster would still be better, right?