Ummmm- not a facepalm. I for one think there should be some sort of seating on -every- major ride for people with disabilites/challenges. It doesn't have to be always used as such- but a seat that could be easily, quickly and safely modified for guests who need additional restraints (Amputees) or who can't easily get into/out of a seat.
Being handicapped myself, I find that a few rides DO have adaptations for getting into/out of seats- and differently built restraints. Volcano:TBC for example, has one seat on each train where the side-bar for the leg can be lowered out of place- making it easier for me (and others, I'm sure) to get onto/off of the ride. There are two restraints- on the side and in front, to prevent any problems along the way.
While I don't stand there and scream EVERY ride should be handicapped accessible (It's simply NOT practical, even if well designed) it should be a consideration for all rides. I'm not going to cry if a park has a ride I can't go on due to the seats/restraints- nor will I force a park to let me on if I can't ride.
I completely agree with you on providing adaptations for seats. My sister has down syndrome and is short, heavy, and not exactly a jumper. It can be quite the task helping her get into a B&M Invert. I really feel that amusement parks need to do a better job of considering those with handicaps, and design their parks with these people in mind.