What are the issues faced by v6-only hosts and are there countries where it is a non-issue?
GitHub is the main problem currently. Some software like composer does not work due to this.
https://github.com/orgs/community/discussions/10539
For countries, if you meaning connecting to VPS, lot of countries have good IPv6 connectivity now. For me both ISPs I use have native v6. This will differ from person to person.
https://www.aelius.com/njh/google-ipv6/
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GitHub is the main problem currently. Some software like composer does not work due to this.
https://github.com/orgs/community/discussions/10539
For countries, if you meaning connecting to VPS, lot of countries have good IPv6 connectivity now. For me both ISPs I use have native v6. This will differ from person to person.
https://www.aelius.com/njh/google-ipv6/