On modern buildings of course you want to build a ramp. But the cost of adding ramps to every already-built place accessible only by stairs is extremely high. At any rate, that isn't to say that it shouldn't be paid, in many cases, just that it's better (when possible and feasible) to develop technologies that let the disabled deal with it themselves. There are buildings with stairs and ramps or elevators. If you're disabled, it's good to be able to access these buildings when you come across them.

Along the same lines, the purpose of accessible digital text isn't only to help the blind, it's also to help the dyslexic and who knows who else, and generally facilitate content extraction software of all types. It's good when to do when it's feasible, but it's better to not have to rely on people doing it.