I mean, REST-ful JSON APIs can be perfectly type-safe, if their developers actually take care to make them that way. And the self-descriptive nature of JSON is arguably a benefit in really large public-facing APIs. But yeah, gRPC forces a certain amount of type-safety and version control, and gRPC with protobuf is SUCH a pleasure to work with.
Give it time, though, it's definitely gaining traction.
Even better quote, I love using this one.
"So, with AI writing code for us, all we need is an unambiguous way to define, what all our business requirements are for the software, what all the edge cases are, and how it should handle them."
"We in the industry call that 'code.'"