I think most people would be hard-pressed to reach 3ft over a bed to tend the plants and weed. 4ft wide beds are usually recommended and of course narrower beds might be more suitable.
High enough raised beds require a lot of making, cost and timewise, and a lot of filling. I agree with welshonion. I doubt that many people in a wheelchair could lean over 3ft to weed.
So, 2 people have attempted to make helpful suggestions and you're complaining.
This won't be a thread for me.
As I do a lot of weeding sitting on the ground,especially when my arthritis is playing up,I know exactly how far I can reach.
Oh , and I,'ve never been normal in my life , and I,m not starting now.