The argument is that IPv6 addresses are UUIDs and any random block is unlikely to collide with any other random address.
It's not about low adoption, it's that there are unimaginably many IPv6 addresses.
...which is a major reason for why it has low adoption
Thanks for the reply. I'm reminded every now and then of the magnitude of the address space in v6. Then I do nothing with that information and slowly lose appreciation for the size again :)
https://xkcd.com/865/