It would be nice to have both options I agree.
As the dad of active little boys I can assure you that the MPC metal frame version with sturdy stamped metal railings is a huge positive in the design. Do you know what happens when one of these engines goes 500 mph in reverse with a string of cars through a switch? It’s not pretty and would make most on here have a grabber. But you know what? Those locos are able to do that again and again and again with nothing snapping off. Just reboot the power and away we go!!