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I likewise wonder from time to time whether I should replace WireGuard's allowedips.c trie with something better: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/lin...

I use Wireguard rarely enough that the AllowedIPs concept gets me every time. It gets easier when I replace it mentally with “Route=” :-)

It's like a routing table on the way out and an ACL on the way in. Maybe an easier way to think of it.

Sure, but how does this differ from a routing table with RPF (which is default in Linux already)?

It's associated per-peer, so it assures a cryptographic mapping between src ip and public key.