For those who want to use the Strava layer in the iD editor, it’s very easy. First go to https://strava.com and login, then go to osm.org/edit, click the layers button -> custom -> paste the link: https://heatmap-external-{switch:a,b,c}.strava.com/tiles-auth/all/bluered/{zoom}/{x}/{y}.png?px=256. It appears only at the maximum zoom of 16 (disappears at very large zoom). This layer makes it much easier to find drawings of new roads that are not yet in the images.

Video tutorial: https://www.youtube.com/watch?v=VUABldSmPk4