I think you could do a cost/benefit analysis on this sort of thing. How much cost does it add to a project and how much space does it take up vs. how many peop

I think you could do a cost/benefit analysis on this sort of thing. How much cost does it add to a project and how much space does it take up vs. how many people benefit and what's the scale of the benefit? In the case of lever door handles or something like returns on stair railings, it's not very expensive and provides a benefit in accessibility or safety. On the other hand ramps are fairly expensive (thousands of dollars to hire a contractor to build one) and take up a lot of room (usually height:length of 1:12 or 1:16, not counting landings). Elevators are even more expensive (tens or hundreds of thousands of dollars plus maintenance) and take up a fair amount of room.