As other have noted, there are many issues here. But many small drivers gives real advantages (at high cost). The ratio of magnet to piston is large (power to weight ratio, basically). Each driver is stressed less and has less excursion, therefore less doppler effect. It allows more power handling and less stress at hgih volumes.
There are also trade-offs, especially interference, which are really complicated and i wont venture into here.
There are also trade-offs, especially interference, which are really complicated and i wont venture into here.