Some ways that ramps can be inaccessible

A reader asked:
I agree with you. I’d just like more information so I can understand it better and imagine it more clearly. How exactly do the people with strollers make the ramps inaccessible to wheelchair users? Do they also make the ramps inaccessible to other stroller users? Or is using a wheelchair on a ramp a lot more difficult than using a stroller on a ramp? Do the wheelchair users need a lot of space? How much? Do they need to use momentum? How can you tell if someone wants to use the ramp?