My experience with non UK and US airlines (at least the ones I use) is that cc don't ask for boarding passes with the exception of boarding long haul heavies. In that particular case I suspect it's done not only as a final check but also to guide pax in the appropriate direction and along the appropriate aisle to their seats. It doesn't bother me either way although non-standardisation of procedures can be just a little irritating at times. For example one particular carrier I use don't follow this procedure on their own a/c with their own cc. However, they also operate a few leased a/c (but still in their own livery) which are crewed by British crews. Their cc will follow their company sops and check passes on boarding. Understandably, this catches many people out who regularly fly on that carrier but perhaps seldom on the leased a/c.
Bottom line is play safe and just keep your pass handy in case. Certainly not worth getting upset about.