Hi again

I didn't mean to imply you were doing anything wrong, I've deleted at least one decorative sidewalk myself. There have been discussions in the talk-gb mailing list (are you on there?) about when it's appropriate to map them separately and when they just add clutter and no useful information. There's someone in Acton creating lots of decorative sidewalks and not joining them to roads too, which is really annoying to me but doesn't seem to be affecting routing at least. I had a look at that MapWithAI task but I don't like needlessly adding sidewalks when there's a reasonable assumption that there are pavements on both sides of the road.
Regarding unmarked crossings, I mapped the status of every street corner drop kerb and tactile paving within a couple of blocks of my home and being able to report on it in Overpass Turbo is really useful.
I've also tried using the pic4review site to create a mission for others to use Mapillary imagery to upgrade the tagging of other unmarked crossings (https://pic4review.pavie.info/#/mission/2738). Not sure about the data quality that comes out of that yet - you have to really check the mapillary image location to identify where in the picture (if at all) the referenced crossing is.
Is the forum more active than the mailing list?