[theFco]

The argument that it is tested 10 trillion times a day is a fallacy (because it can't be that only the most popular option should be the best forever). And furthermore, in this context "tested" is a bit of an overstatement, I would say "used" many gazillions of times a day.

[dogboat]

It is used so much across the board for FE and BE and CI and config.

Despite the heavy usage I it hasn't been canned and I have never heard anyone at work complain about JSON for any reason.

You could say it is network effects but if it were crap you could replace it much more easily than say moving from Python to Java or whatever. Especially for internal microservice stuff and perhaps front end.

JSON and the tooling is basically solid. It is a non-concern.

[buzzardbait]

Using is testing. The whole point of automated UI tests is to mimic usage.

A random click on a website might not be a great test, but it is a test nonetheless. And if it fails enough times, someone somewhere will be held accountable.