True, but the OP's worry is lacking sufficient connection time to make the newly scheduled connection ( offered by US ). In this specific instance, this change does not necessarily negatively impact the OP given what their main concern is: to make a flight PHL-RIC the afternoon of arrival. The real dynamic in play here is that one can never count on any international-arriving flight to be on-time every single day & the feasibility of making that early connection.

The OP's real dilemma is twofold. Arrive late and miss the (US rescheduled) RIC connection -- in which case US is on the hook to either connect them on a later flight, or . . . to arrive slighly late, but with enough time to make the rescheduled RIC flight, but perhaps without bags ( which should then be door-delivered by US at who knows what time).

Either outcome has positives/negatives. If a checked bag making it home at the same time with the OP is not a game breaker & simply an inconvenience, then the better move might be to accept the schedule change & hope that the travel gods are kind this day. Locking into the later flight could mean a missed opportunity ( granted by US making the change ) to get home sooner if the headwinds are weak, the weather gods kind & the flight arrives on-time or even a bit early.

In truth, I don't think there exists a "right" answer to the OP's dilemma of whether to aqccept changes as much as it comes down to personal preference & personal travel disposition and what one is comfortable with.

Have a good flight in any case.

Barry