Programming is the process of manipulating data structures, so if you're building a JSON server, then every piece of code in your server is going to be dealing

Programming is the process of manipulating data structures, so if you're building a JSON server, then every piece of code in your server is going to be dealing with and operating on JSON data structures. It can't be neatly tucked away in a corner. Because it would be foolish to design a server that makes needless copies of all its inputs and outputs. This truth would be the same if you were using something like protobuf instead. Therefore it's important that your fundamental data structures be something that (a) you can control, and (b) doesn't make everything it touches take forever to build. Do you feel in control of someone else's 24000 line header full of template magic? If that thing is sitting between me and my data structures, then I will wipe it out of existence.