Buf plus Protobuf already give you multi-language codegen, a compact tag-based binary format with varint encoding, gRPC service generation, and practical tools like protoc, descriptor sets, ts-proto, and buf's breaking-change checks.

If Skir wants to be more than prettier syntax it needs concrete wins, including well-specified schema evolution rules that map cleanly to the wire, clear prescriptions for numeric tag management and reserved ranges, first-class reflection and descriptor compatibility, a migration checker, and a canonical deterministic encoding for signing and deduplication. Otherwise you get another neat demo format that becomes a painful migration when ops and clients disagree on tag semantics.