One thing that made me a bit nervous to start editing is the lack of an easy way to roll back changes, at least I couldn't find one using the iD editor. If I make a mistake and save it I need to do new edits to try and fix it, possibly making things worse, instead of just removing the entire changeset. I had some issues with multipolygons and had to edit the same things maybe four or five times before I got it right.

And why isn't the Strava heatmap easier to use? They allow OpenStreetMap to use the heatmap for tracing [1], but doing so in the iD editor requires you to copy a long url from the wiki and use a custom layer. This only shows the heatmap, no aerial photos or other mapping data, and it disappears when zoomed in too much.

[0] https://i.imgur.com/V4Tn96F.png

[1] https://wiki.openstreetmap.org/wiki/Strava#Data_Permission_-...