Thing is though, most of the high level languages have that part "solved" via libraries... Hence lots of people don't see the need to test it, as they expect the library to have sufficiently tested already. That leaves your tests mostly centered around your domain/business logic

Personally I'm just doing web api dev/backend atm and have to say that at least in this domain, pretty much everything actually hard is solved.

The only difficulty is the "interesting" architecture decisions people like the OP introduce, making inherently trivial problems into multi week endeavors which need coordination between dozens if not hundreds of devs

> Thing is though, most of the high level languages have that part "solved" via libraries... > ... > Personally I'm just doing web api dev/backend atm and have to say that at least in this domain, pretty much everything actually hard is solved.

Color me extremely skeptical!