Pretty much every large well known tech company uses an IDL and binary format to exchange data between their very large number of services, so that says somethi

Pretty much every large well known tech company uses an IDL and binary format to exchange data between their very large number of services, so that says something about why this might be a critical piece of the puzzle over have ad-hoc interfaces and shoving JSON everywhere. JSON isn't a very efficient format to send and store data in, and it's a terrible IDL.