I think Rolf nailed it. Also, if you don't have the proper venting the efficiency of dust removal will decrease. As was mentioned earlier, with just a tiny bit of dust you won't have to empty the bag very often.
I have no limitations in the shop but I can only imagine what you're going through. I've seen videos of folks scrolling and turning with their feet so I told my wife if I loose the use of my arms it just means I have to learn to use my feet.
Good luck with the healing process and don't push it too much.
Maybe, we as the scroll saw community, need to voice our opinion to these manufacturers. I doubt if many of the "big" manufacturers have ever used one.