agreed.   One a sidenote, yesterday i introduced a briefer way to
specify argument names.  Your example would start like this:

    @pytest.mark.parametrize("wx,expectedCoverage,expectedTrend", ...)

and you can also have spaces after the commas if you prefer.

I'd recommend to write a wrapper "@myparametrize" which generates a
pytest.mark.parametrize() instance in the end.  This way you could use
and consolidate your API ideas in real life with today's pytest in real
life before aiming for pytest inclusion.