It might be an "American" thing, and I know the overseas version of the Escape had an optional remote release for the fuel filler door.
I'm guessing the big thing is cost. Much cheaper to have a simple hinge and let the driver open it, than to have cables and springs running to the driver's seat. Plus much of the States are rural areas, and if it's anything like up here, you're more worried about people trying to
give you gas if they thought you were in trouble.

Our Fords both have manual filler doors, as did our Pontiac Trans Sport (it's still around town). Our Acura and our Mitsubishi both have remote releases.