It’s intended to be human readable, but it’s not and its slow adoption is proof of that. A random 10 digit string would arguably be better.
> It’s intended to be human readable…
What? No.
Facebook did some brute forcing to slip `facebook` into their Onion URLs, but no one's intended to be typing these things out.
> It’s intended to be human readable
Says who?
> slow adoption is proof of that
No it's not. There are many plausible reasons for the slow pace of IPv6 adoption. Poor human-readability of addresses is among the least plausible.
You mean base64? 10 digits is only 10 billion addresses