Thanks, I should have given more context right away. I have been adding a lot of details for (wheelchair) accessibility and connecting bus stops to the sidewalks is an important part of this. On the ground, many bus stops are not accessible from sidewalks (maybe they are on gravel or grass, or directly on the road). If all bus stops are mapped with their connectivity to the sidewalk, those that are disconnected from the sidewalk are more obvious in their limited accessibility. I have also been adding a description that describes the accessibility (which might be redundant). Maybe we could propose a new tag that describes this instead but I think mapping the stops as either connected or disconnected to the sidewalk is the best way. In some cases I have added a little 'pigtail' path between the sidewalk and bus stop if the stop is not directly in the middle of the sidewalk.

Some examples:
https://www.openstreetmap.org/node/6789689735
https://www.openstreetmap.org/node/5833868302
https://www.openstreetmap.org/node/12484734231