They are two issues really:
One - is one of efficiency. Poorly clustered stops make the service slow and inefficient for all. Pair this with the complete lack of bus lane policing, and we have the current slow mess in Dublin.
Two - is of ease of use. Better infrastructure (footpaths, shelters) and driver discipline at stops, and better routing and loading, all encourage use for able-bodied and less-able passengers alike.
Some of these factors are more important for the less able. I’m thinking of my elderly neighbours, but also of myself in 20-30 years time. I’d tolerate a 500m walk on poor paths in bad weather to the bus stop now, and then stand there with no shelter in the wind and rain. But not sure I’d feel as able to do so if less abled.
Maybe in 20 years time I won’t worry about this as I’ll be using on demand autonomous car services… and so sitting in traffic with everyone else! Or I’ll be dead! There’s a range of possibilities!