> if they have notable github projects, why do you want a new feature
It might not actually be their project.
> but ideally your interview methods are equitable across all candidates
My candidates are not competing with each other, the tests do not need to be "equitable" between candidates, just fair for that candidate.
One problem, for instance, with github projects is that it's a fairly privileged position to be able to have significant side projects. So it's not fair to expect a candidate to have a github presence and you would be eliminating people without a lot spare time (single parents is the go to example).