If you're under the impression that the Bose stytem is not loud enough, then you have serious hearing damage. A full, rich, efficient sound system that covers trhe largest rooms with clarity and presence is a joy for the performer, as well as the audience.
Granted, some younger audiences, or some older ones with hearing damage may require that ear splitting, harsh sound that many PA's deliver, however, I have never had any client ask for more sound that I could not deliver.

I will admit, that for a 20 yr old crowd, doing lots of modern dance stuff, I may add an additional woofer, but I would still use the single Bose tower. The added, "in your face bass" is all that's required to make the L1 sound as raunchy and over bearing as the huge, heavy boxes on sticks.

Sure, it's all preference...but the proof is in the performance. I can do a living room cocktail party or a football field pep rally with the same, 10 minute setup, and still have room for 5 adults, with luggage, in my car.

Free speech ... freedom of choice. Give'em something worth remembering, and they'll come back. Some take longer to accept change than others. I saw the Bose, and fell hard in an instant. I "heard" it. and stayed down for the count !