you can ask the same question about IPv4 and get same answers.
But ask auto-mechanics, and hoo boy, will there be opinions.
I think this elides the point really.
People don't know when an issue is because of ipv4, for a good example: network issues in online video games are often caused by being unable to NAT punch, lag can also be because connection information is relayed by some far away STUN server. Same with in-game voice chat.
Usually you need to set port forwards to make games work properly.
In the event of GCNAT a customer has no possible recourse.
But nobody understands the issue is largely because of IPv4, they just assume that's how it is, and assume the same issue would exist with IPv6
Larger providers (zoom, apple/facetime, twitch, ...) just set up relay servers and avoid p2p altogether - which cost money, increase latency/jitter, and decrease privacy. You can argue all of that are hidden costs of sticking to IPv4 for longer than we should have.
Yeah, maybe some ISPs should be listening to their customers more (I heard tales of ISPs in the US), but in this they're not wrong: consumer demand really is low.
I've switched between IPv6-connected and IPv4-only quite a few times over the last 20 years due to moving to different countries with different options and was a fairly "early adopter" back in the day with the tunnels XS4ALL had, and even as a technical person I can't say I ever noticed the difference.