Street maps are already in a good shape. What's not in a good shape - public transportation software and data - metro, tramway, commuter rails and big railways, buses. For example, OpenMetroMaps[1][2] barely gets any attention. And usually such maps are limited to particular cities or countries. Creating something like MetroMan app that supports so many cities, would be great. There are also Transportr[3][4] or abandoned (it seems?) Transito[5]. More people should collaborate on such projects. So far, most of them tend to be just solo developers.

[1] https://www.openmetromaps.org/

[2] https://github.com/OpenMetroMaps/OpenMetroMaps/

[3] http://transportr.app/

[4] https://github.com/grote/Transportr

[5] https://git.sr.ht/~mil/transito