"trop" = "too much".  If that is too much for you, you can always turn off quests in the settings of StreetComplete and it will not bother you again.

Sidewalks are mapped in detail here, and information should be entered on the kerbs at the end of every sidewalk + information about crossings is also on the crossing nodes (crossing nodes are required because they are used by some apps that guide motor vehicles to inform about approaching crossings).

We have ample Mapillary coverage here, I filled the missing tags.