Tailscale have a great FAQ about IPv4 vs IPv6: https://tailscale.com/docs/reference/faq/ipv6
If you're not an expert in this area it's worth a read - I certainly learned a few things!
"IPv6 is the next generation of the Internet Protocol (IP), the successor to IPv4."
This is a misconception. It is not the successor to IPv4, it is an alternative. Maybe the alternative is so good it will eventually make the older extinct, but it does not look like that
That was excellent, thanks for recommending it. I particularly liked how it's a pretty factual FAQ, not particularly cheerleading for IPv6 nor saying "IPv6 is a failure, give up on it".