We used to operate a satellite office whose primary internet service was Mikrotik directional AP’s bridged at both ends and this was maybe a half mile line of s

We used to operate a satellite office whose primary internet service was Mikrotik directional AP’s bridged at both ends and this was maybe a half mile line of sight uplink. My testing even on gigabit chipsets mirrors your 400 mbit per AP comment, at least in my situation.