Both of these spots are convenient for me, and I noticed that neither of them really serve pork dishes.
PUS used to have one item, pork dumplings that are no longer on their menu.
I did a little digging, and there was an article on the chef who creates the Panda Express dishes and is retiring after 30 years. His last was a pork rib- they are pretty good.
I have racked my brain (such as it is) and cannot figure out why 2 popular chains don't do more, or any pork.