As bad of an idea as memorizing addresses is, they're only so big if you use all of the bits. If you manually assign addresses, most of the bits will be zeroes

As bad of an idea as memorizing addresses is, they're only so big if you use all of the bits. If you manually assign addresses, most of the bits will be zeroes or low numbers, which means you can just collapse them. E.g. if you had a /32 and two dns servers, the second one might be reachable at 2400:123:d::2, which is exactly as long as say 143.239.132.2. And because you only get at most one octet to play with on v4, you can't easily make your addresses more memorable either.