I have deleted these useless sidewalks. As a pedestrian, I find it terribly inconvenient to move 5 metres vertically between footways, even when there isn't solid concrete inbetween. I have deleted this useless and irresponsible fiction.

The mapping of pedestrian infrastructure in OSM is actually used by real people in the UK and doing it badly causes real inconvenience. This is an area where doing the job badly is invariably worse than not doing it at all.