1. Well defined scope
2. Infrequent changes
Nomad has many of these (msgpack, envparse, cli, etc). These dependencies go years without changing so the dependency management burden rapidly approaches zero. This is an especially useful property for “leaf” dependencies with no dependencies of their own.
I wish libraries could advertise their intent to be Mature. I’d choose a Mature protobuf library over one that constantly tweaked its ergonomics and performance. Continual iterative improvement is often a boon, but sometimes it’s not worth the cost.