Maybe the rabbit hole is much deeper than it seems.

Is it really possible to reconcile "no bloat" with "fully standard compliant"?

Maybe have a look at https://github.com/eyalroz/printf, if only for the test suite, which looks pretty comprehensive and still fails.

Maybe "key features" does not mean the same in all projects, making every project appear "unnecessarily bloated while missing key features" in every other context?