Although frankly the functional part of most V6 addresses isn't that much more. Using ULA, of which there are enough of that organizations need not fear constant overlap like 10/8, the network side of our private internet space is only 6 characters and fixed host addresses are often 2. eg, fde3af::1.
We get cute with 6to4 mappings and some routing games and so they may look more like fde3:af00:12:34::1 but the local subnet is handed out via prefix delegation so end users rarely, if ever, need to care.
How do you fit the fixed 8-bit ULA prefix (fd00::/8) plus the 40 random bits you're supposed to use for the Global ID (per RFC 4193) into six hex characters? It should be at least 12, e.g. fdXX:XXXX:XXXX::/48.
As for remembering addresses, yes, just use (m)DNS. You can even set up an mDNS Discovery Proxy[0][1] so that devices which don't support mDNS themselves can resolve the names via regular unicast DNS.
Why would you do that, when there are so many good tools you can use to do it for you way better than your feeble grey meat sack can?
I mean sure, I remember 127.0.0.1 and 8.8.8.8 and 9.9.9.9, but decent passwords these days are no more memorable than ipv6 addresses.