Non "Entry Level" airlines don't want to have to teach you anything to get you up to speed on their equipment. They want you to be fully qualified and experienced in the basics of what they fly. Glass, FMS, jet, etc.

I've seen it first hand where pilots with thousands upon thousands of PIC in a turboprop (but no jet time) were seen as a bigger unknown than pilots with Jet SIC and no turbine PIC.

I don't completely agree with that, in fact I don't at all, but it happens.