It's me again. If pedestrian stairs are difficult to work with for the developers, can I instead suggest modular stairs that can be added to roads. Fixed overhead pedestrian bridge assets that can be added as a modular part. Add it into the road services maybe.
As of now, player built pedestrian bridges rely on very long slopes that are twice the distance of any road crossing, or if made using dev mode, will be illegally steep due to safety concerns.
On the same note, elevators for overhead bridges and underpasses for accessibility options. (I understand there's no disabled cims, perhaps they can be added in the future? ♿ 👀)