In my area, there are a lot of designated MTB trails. They mostly lead to some up-hill restaurant. In OSM they are all mapped highway=track, because that is what they are, forestry roads, where cycling is allowed by contract with the holders of the way. People are expected to go back and forth there and cyclists and pedestrians welcome each other.
Then there are the dedicated single-trails. The official ones also allowed by contract with the landowners. They sport signage warning walkers to not go there. This is not legally binding. They also sport signage of being one-way for cycles. Also not legally binding. They are all mapped highway=path and a plethora of attributes. Very appropriate.
Thankfully they are not mapped as cycleways. In my view highway=single_trail could do the trick much more comfortable for both mappers and users.