The honest answer? It's a thinly veiled reason to complain for more options

Loads PWM-PHL are high right now, and fares are up accordingly, even with US adding mainline E90 service to PHL. That's 6x a day, was previously 5x. DCA is still 4x and CLT is still 1X.

With that much connectivity and the fares staying high, I'll often just drive down to BOS to fly the AA BOS-LAX or AS BOS-SAN, but I'd often rather take a connection out of PWM. I'm guessing now, but adding ORD might ease fares because it's an unserved hub from this location, meaning a lot of us will not be competing for the same seats at PHL.