Audience member mentions friends at Google claiming gRPC isn't used there anymore, and recommends Twirp (developed at Twitch, based on Protocol Buffers) as an improvement he has had good experience with. Emiliano counters that his own Google contact says gRPC is used a lot; both may be true because Google is so big. He stands by his own production experience using gRPC in a snowplow fleet-tracking application that needed to scale from zero to ~10,000 vehicles the moment it started snowing in Italy — performance was impressive even if integration was harder.