Sometimes you just want to dump the bytes that are going over the wire. Sure you could pipe the output to a protobuf parser, but then you'd need to make sure the output of tcpdump or ngrep or whatever is what the parser expects. As an example, I needed to track down why some service traffic was getting misrouted, and I found the problem by tcpdumping the traffic and realizing one service was silently corrupting a header value - I could have added more debug logs to either service, but that would have taken a lot longer to implement and deploy.

Personally I'd rather stick with the simpler protocol until someone runs the numbers and finds something more efficient would improve performance or save money by a significant enough amount.

> until someone runs the numbers and finds something more efficient would improve performance or save money by a significant enough amount

This argument must be the ultimate defense in code review. The thing is, we have the field of theoretical computer science and things like big O so that we can reason about code without having to do benchmarks about every little thing, because that's impossible in practice.

Regarding protocols, I'd argue that the most important thing for them is to be efficient, at least when IO is still the biggest bottleneck of computing. The other comment already points out debug being a tooling problem.

One of the biggest culture shock moments when I came back to the web world after spending time in high performance environments was how many resources web applications were willing to waste on parsing and sending terribly inefficient wire formats.

I’ll never understand why we’d make the trade off of making crazy inefficient human readable protocols for talking between computers instead of learning wire shark.

They're not just inefficient, they're also harder to work with! Binary formats are rigid and less corner-casey. Human readable formats are a total false economy.

I think you’re correct, it is a tooling problem, but that’s just as valid a problem class as any other. Part of the issue with solving tooling to deal with binary formats is the lack of self documentation. Reading JSON off the wire, its structure is immediately usable and understandable, whereas in most cases for a complex API, a binary protocol requires some foreknowledge of the structure of the data coming back. In the future, if we can create an efficient combination of binary protocol and self-documenting data structure, I’ll gladly change my mind entirely.