In the first place, it was unclear whether “unsuitable” referred to reachability or merely preference or comfort, but I suspect it was the former. It isn’t difficult to come up with realistic scenarios where permission is beside the point but reachability is important. The existence of a gray area doesn’t invalidate the cases at the extremes. We don’t need to relitigate the pedestrian oneway=* discussion here, but there are clear parallels.
To reiterate, until there’s a mechanism for indicating reachability that’s as straightforward as the mechanism for indicating permission, the existing access keys will remain skunked (and maybe it isn’t even the big problem we make it out to be). An excessive focus on legalities inherently leads to awkwardness in situations where the only law that applies is the law of physics.