Right now I do not have any physical limitations as my back was bolted together a few years ago. That said the DW and I are both getting older and we appreciate the convenience of our Class A. Since we travel a lot and very seldom sit in one location for more than a day or two, hook-ups are pretty basic. I plug into the electric and ONLY hook up fresh water to fill my tank, or sewer to empty my waste. Water, sewer and waste hook-ups only happen once a week or so. I can level the coach from the driver's seat, do not have to chock the wheels, and can push a button to raise my satellite antenna. The slides also require only a push of the button. If it is raining outside, we can spend the night without ever having to go outside.
In a class A, the DW can easily get up and go back for a drink or something to eat, while we are heading down the highway. Naturally some people feel this is dangerous, but that is their opinion. My DW makes her own decisions.
The view out our large windshield certainly makes the drive safer and more enjoyable when we are on a scenic road. The fact that we are sitting a few feet higher than in a class C, plus the much larger windshield, makes it easier to monitor what is going on in front of us on the highway.
After having a B and a C, we feel that the A has so many advantages that the extra step or two to get in is a minor problem. Naturally the obvious plus is that for the exact same overall length, the A will have more interior floor space than the C.