It helps me, when interviewing people (already past the HR screen), to make assumptions about what we don't need to talk about. I'll still do my checks on your knowledge to make sure you aren't just a cert collector who has no real hands-on knowledge, but it tells me that there are certain things I probably don't have to dig into.

Aside from that, I'd agree - it's a variable to plug into a dumb screening system to make you appear on the "good" list.