Stairs-only are not encouraged in newly built pedestrian bridges any more in England. The move is to always include a ramp so as not to exclude wheelchair users. I don't see the point in taking up space in my simulated city with both stairs and ramps, or stairs and lifts, so I am happy to have just ramps.
What we actually need to make the existing pedestrian bridges better is for a one-click raise to only raise it to the bare minimum height for clearance of the road beneath, so we don't need to have such steep slopes or long run ups, and to be able to turn the ramps sharply on a dog-leg so they don't have to start miles away from the edge of the road the bridge is meant to cross. They need to be only one tilewidth wide, and to be able to double back on themselves in just two tilewidths