You seem pretty active with OSM, so I'll propose this here since I don't have time to make it.

OSM is very, very popular with hikers and cyclists, and I'd argue rhey drive a lot of it's use, especially via third-party systems. However, it's one failing is "gravel" roads. While they support many different gravel road types, they admit on their Wiki that use of the proper terms is low.

Given the heavy use of Garmin devices, especially among gravel cyclists, mountain bikers, and bikepackers, where terrain definition is important, it would be outstanding to have an app in the Garmin store for Edge devices that could report the exact terrain type (compacted, dirt, etc) with a button mash as you ride it.