[tikhonj]

Sure, but you can work around gRPC's issues too—"workable" might be the only bar that matters in practice, but it's a remarkably low bar.

The risk with JSON is that too many systems understand it, and intermediate steps can mess up things like numeric precision as well as being inconsistent about handling things out of spec (field order, duplicate fields... etc). This definitely bites people in practice—I saw an experience report on that recently, but can't find the link just now :/