[webmaven]

Having certifications is really just a checkbox that helps get past stupid HR filters that would prevent you from getting to the interview in the first place. Or, best case, bump up the priority of your application.

Once you're in the interview the focus is no longer on "knows how to use X" but on "knows how to use X well", which besides technical trick questions to try to suss out whether you really understand the stuff you were tested on for the cert, also includes things like communication skills/style, handling disagreements and conflict, prioritizing, triage, etc.

Basically, not just can you do the work, but can you do the right work, and can you get stuff done.