I suspect you believe that IPv6 is just "IPv4 with bigger addresses", and furthermore that "IPv4 addresses are a subset of IPv6 addresses".
It isn't that and they aren't.
Low IPv6 adoption has nothing to do with dotted decimal address notation, and everything to do with IPv4 remaining good enough thanks to user acceptance of NAT and the concentration of power in today's network in the hands of a small number of large companies.
Low IPv6 adoption has nothing to do with dotted decimal address notation, and everything to do with IPv4 remaining good enough thanks to user acceptance of NAT and the concentration of power in today's network in the hands of a small number of large companies.
And : 2001:4860:4860::8888