Yggdrasil Network

I really like the idea of address being derived from public key, but there is a problem with this approach - since Yggdrasil currently uses IPv6 addresses, the length is very limited and you can find collisions (there is a workaround which involves brute forcing a key with more leading bits). As I understand, the long term plan is adding a custom protocol which has no limits for address length.

My napkin math says it'd be plausible to generate a pair of colliding addresses (birthday paradox etc.), but still implausible to collide with the set of existing in-use addresses. How much would the former actually matter, in the context of Yggdrasil?

Why not use the entire public key and let entropy do the rest, like the Reticulum Network?

Truncating the public key to fit in an IPv6 address isn’t totally ideal, agreed, but for now it means that just about any existing IPv6-capable application will work over Yggdrasil without modification, which is a nice property for a testnet.

What about truncating a hash of the whole public key? (what's what I'd assumed was happening already)