IMHO getting an item that can't be equipped is hardly reason to prevent an entire mod being installed. Especially if there is no actual confirmation that there is actually an item that can't be equipped. And if there is such an item, better to report and fix it than to stop people from using mods.
As for the BGT stuff: I have no idea what's going on, but anything relating to BGT can only be an error, for reasons I already explained. So that rule or whatever should be removed from BWS. MnG #210 should be unavailable on BGT, full stop. That's the only installation rule needed.
Facts not polemics.
Even if BWS raises a conflict warning for a single component, this does not prevent the mods to be installed. You can even simply acknowledge a conflict and go on ("I will not even recruit Garrick, why should I care.") without resolving it.
As to the BGT errors, I simply report them, I am not dealing with BGT settings in BWS unless someone who has the game and tested the settings gives me instructions for it.