There were some major issues with click through and mesh surfaces that even Asobo didn’t understand until a user showed them a way to get it to work so you didn’t click things behind the mesh. As you noted, there was no standardization on the use of mesh surfaces (which the instruments / tablets/ GPS lie upon) because as you noted unclear SDK documentation, so developers have been having to do their own thing.
I believe the SDK team are working on fixing this functionality and properly documenting it as well.