I don't think it has anything to do with "humbleness". It's that there isn't really a way to formally gather and have people that haven't really ever used the

I don't think it has anything to do with "humbleness". It's that there isn't really a way to formally gather and have people that haven't really ever used the application before, but know enough about the problem domain to be useful in testing. Not to mention that it's a non-renewable resource, once I've done it with someone for a specific part of the app, they are "burned" (at least for a few months). (that last sentence came across really... shitty sounding, but I can't figure out how to reword it to get the point across without sounding like I'm treating people like old computer parts, so I'll just add this disclaimer...) Any kind of "formal" process ends up just looking like QA, and they end up making the same kinds of assumptions that the developers and designers do since they work and know the application just as good if not better than them.