I would say actually in the vast majority of cases of accessibility interventions, it benefits everyone. Everyone is, at various points in their lives, a varying degree of disabled (defined in terms of functional deficits). Whether injured, pregnant, chronically ill, a wheelchair user, elderly, or — heh — even intoxicated, thinking broadly about users of the spaces and tools we design is always going to yield more positive than negative externalities imho.
In cases where this is not true, I’d challenge designers and engineers to find more novel designs that can genuinely be used by anyone and not cost too much inconvenience. This can sometimes mean starting from scratch and questioning our assumptions. Eg. Even the need for a curb-to-street indicator presupposes a street that is used by both big metal vehicles and pedestrians, whereas perhaps there’s a solution that means those paths never cross. Ie. More fundamental urban and transport design instead of band-aiding atop legacy systems.
In cases where this is not true, I’d challenge designers and engineers to find more novel designs that can genuinely be used by anyone and not cost too much inconvenience. This can sometimes mean starting from scratch and questioning our assumptions. Eg. Even the need for a curb-to-street indicator presupposes a street that is used by both big metal vehicles and pedestrians, whereas perhaps there’s a solution that means those paths never cross. Ie. More fundamental urban and transport design instead of band-aiding atop legacy systems.