This is one of the big problems, the HP driver really needs another driver to get it to the tweeter.
After many listening sessions with the M5, I don't hear any problems with having to electrically cross the HP driver to a midrange. The mid-woofer in the M5 is very dispersive and improves the directivity and sense of space. A speaker with an HP driver or two crossed to a tweeter would certainly improve the bass compared to an M3 but wouldn't improve directivity over a dedicated mid. If you're thinking of a driver that has the HP and mid-woofer properties, that would certainly solve some problems particularly for active systems.
