[rdtsc]

REST + JSON is simple, easy to debug, and it does the job. Web clients speak JSON, servers speak JSON, humans can read JSON usually. JSON can be gzipped so you get some benefit there.

gRPC is another large pile of foreign C code that's essentially a black box. If there is a buffer overflow there that your code hits only somehow, you'd have to know how to debug it and fix it.

Also chances are you are not Google, Facebook or Amazon , and you don't really do BigData just your know, regular data.

[ska]

   and it does the job.

It does some jobs admirably. Because of the tooling and familiarity, it's often asked to do other jobs, and here the results are decidedly mixed.

[euyyn]

> gRPC is another large pile of foreign C code that's essentially a black box

Not for web, as this is generating Typescript code on top of the fetch API.