Glad that someone else noticed that protobufs are very close to a carbon copy of ASN.1. If you don't have the .proto file you even see the .1.3.6.1.2.1 paths in protobuf files, just like you do without .mib files.
Even the integer encoding and tooling is very similar, just not quite identical.
Even the integer encoding and tooling is very similar, just not quite identical.