I've had "native" IPv6 service for something like twenty years. I've not had a problem with accessing any of the internet.
If you're hinting that roughly half of the internet-connected servers don't have IPv6 addresses, then my reply is "so what?". Only idiots are suggesting that folks who aren't running an experimental lab (or ISPs that have the expertise required to set up the NATs needed to reach the IPv4 internet from v6-only service) go IPv6-only.