When creating a new flowtable or netdev-family base chain in nftables, the specified interfaces should not need to exist already. Also, if such interface is removed/renamed and recreated (or another interface renamed to the old name) things should continue to function as expected.

A second feature (tightly connected to the above so handled as one here) is support for wildcard interface specs. Like with iifname/oifname matches, one might want to have a common netdev-family base chain for all interfaces matching a given name prefix.