@DeBigC Thanks for you comment!

Luckily in The Netherlands all buildings have already been imported based on government data, but there are still a lot of missing 3D building tags. I like how nice 3D maps start to look after adding all those tags.

Definitely good how StreetComplete helps a lot with all road details like sidewalks, surface, cycleways, etc. This way I can just draw in new roads on my desktop, and easily add details later using StreetComplete. Also looking forward to contribute to it on the development side of things, since my profession is software developer :)