You're making a big deal out of nothing really.
If you are an average person then getting a doe to the truck from 100 yards is no problem. It would be more hassle for most people to get out a wheelbarrow then to just drag the deer that distance.
Game carts come in handy in some circumstances no doubt. Especially as guys age probably and dragging or packing out a deer isn't as safe on the back as it is for younger folks. But most of the places I hunt in I couldn't get a cart into anyway.
-Jake