Comment by 9rx

> But shouldn't the check just be that the candidate has used more than one different stack?

If you had another filtering mechanism, perhaps you could do that. But what other arbitrary, legally acceptable, filter are you going to use to further narrow the search? Can't realistically throw out all the resumes with female-sounding names, for example. What is going to keep you out of trouble is quite limited.

Why not throw out all the "Rails" resumes? If you had all the time in the world you would interview every last person, of course, but in the real world, with real world constraints, you have to pick a few to interview and live with your choice.

To use the internet's favourite analogy: It's like buying a car. Most people would never find it reasonable to test-drive every single one of them. It is just too time consuming to do that. So, instead, one normally looks at signals to try and distill the choice down to a few cars to test drive. You very well might miss out on what is actually your perfect car by doing that, but if you find one that is good enough, who cares?