That is certainly possible. I’d rather understand Steig in this combination not as a reference to the noun Steig but to the verb Steigen though. That way, Steigspuren are traces of people using an observable area in the terrain for passing. A member of a local chapter of a rambling association once told me, in order to have a Steig registered with the cartographers, the clearly delineated area that it covers has to be at least so wide, that you can stand on it with both feet side by side.
Probably – I still hesitate though to add this as a clause to the benchmarks: “must not meet the criteria for trail_visibility=excellent”, while trail_visibility=good might not be wrong:
The difference between Steig and Steigspuren is rather qualitative than quantitative, I’d say. For a flash, I thought, picture above might tell consumers quite a lot of what an OSM
Note, that the official map uses Steigspuren in a much broader meaning, a bit like, anything that can be mistaken for a game trail perhaps? I do not know for sure.