Don't fall into that trap. It's perpetuated on the commuter board for whatever reason, by old, cranky commuter lifers.

Hiring at all levels is done by HR professionals and management pilots. It's done in a panel format so as to exclude any bias that could arise in the form of what you stated.

At the commuters, your goal should be to:

a) network and keep your nose clean
b) upgrade
c) get into the training dept or become a check airman

Regardless of where you are, that is the magic formula. There might be something to obtaining TPIC via a jet not prop, but prop guys are hired across the industry as well. AFAIK, jetBlue has been the only company with a hard-on for turbojet time vs. turboprop.