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One consideration is if most of the candidates don't know blub, the rare candidate that does is harder to measure.

Another consideration is if they can't get their act together to respond in a reasonable time whilst they are wooing you, how are things going to go if you're hired?

Interviews go both ways, and I think you've found a company you don't want to work for, even if you think working in blub is your #1 criteria, it seems that having timely communication is important as well.