given that laptops don't -- that the phone would only be able to charge off one.

My personal Framework 13 can charge from either the left or right side USB-C ports, and my work Lenovo Thinkpad can charge from either the dedicated USB-C slot, or the USB-C dock port. Point is, as USB-C gains more widespread adoption, limiting a device to only using one port for charging is becoming much less common.

That said, Framework does point out that not all the expansion bays can deliver/receive the same amount of power and they recommend (at least for the 13) to only use the rear ports for charging.