What you actually said was:
Now quite apart from the fact that the whole discussion we’ve been having is about mortars / sky walls, you stated that the hint brush changes the ‘typical rooms with ceiling skys’ idea. Which it doesn’t, so you are wrong in that context too 
Anyway, cheers for letting me know about the mortars - is a bit of a relief
It makes me wonder how the code handles a mortar going into a sky wall and through the void to re-appear on the next skywall.
Is it possible that it’s fine as long as there’s no other blocking brush in between - maybe another (redundant) boundary caulk brush or something? Without knowing the code I can’t say how it handles this - personally I’d hope (IE it’s how I’d do it) that once a mortar or something goes into a sky wall, it carries on being process but without collisions until it comes out of another sky wall - everything in between is ignored. But it’s entirely possible that that’s not the case.