One of the reasons for not connecting the steps to the roads (which could be argued is one way of micro-mapping for now) is that kerbs are mapped as well. That would mean you'd have intersections between the steps and the kerb, which is arguably wrong here since you don't cross the kerb when mounting the steps. So at least for now it's a way of potentially capturing access restrictions to these entrances - and micro-mapping down to the level of sidewalks might not be something entirely desirable (at least for now) in a low traffic neighbourhood without many marked crossings.