The router is Fast Ethernet (100Mbps). It would take a significantly more expensive SOC, supporting circuitry and a larger case with ventilation, to run a Gigabit Ethernet router. If you don't want to use it, then don't use it. Likewise, it would raise the cost of manufacture to add another SLIC to support another phone port.
My car has fog lights. We almost never get fog here, so I don't use the fog lights, but it had no impact on my decision to buy the car.