Comment by cyberax

Protobuf is good, but it's not perfect. The handling of "oneof" fields is weird and the Python bindings were written by drunk squirrels, enums are strange, etc.

gRPC is terrible, but ConnectRPC allows sane integration of PB with regular browser clients. Buf.build also has a lot of helpful tools, like backwards compatibility checking.

But it's not worse than other alternatives like Thrift. And waaaaaaaaaayyyyyy better than OpenAPI monstrosities.