We started doing this because of the traditional way we used to do bass management.There is a huge reason to play your LFE over multiple subwoofers. Why do we use more than one woofer? Simply to get the SPL we need at these low frequencies. I use closed 10-12" drivers - you need a few of them to get the needed level at 20Hz.
I hoped with ART the system will use all of the woofers to produce sound and at the same time to chancell it - this would be huge for DBAs, double the amount of speakers to be active, instant 6dB more SPL (which could save quite some money during design).
With ART i would be more than happy to:
1) crossover at lower frequencies than 80Hz
2) use one beefy 15 Inch sub instead of 4 10 inch or 4 12 inch as it will be supported by my speakers (unless my room is really large and my modes are below 40Hz).