It only solves problems you cause yourself by what I consider improper use. You compromise where no compromise is needed. And why? Not because it is good, but because you are used to it. I'll try to explain later.
I agree with Scott. It is about control. Also keep in mind that there are many kinds of gigs. These days I don't do any bar band audio. I am mostly corporate. I may have 1 podium or Lav, a dozen lavs, or a rock band the CEO wants to party with after the general session. A typical system for me has some combination of main LR, front fills, subs, over heads, and delays. I control them with a combination of Aux and Matrix, depending on the needs of the gig and the equipment provided/available.
Given all that, what physics involved dictate that I need to have any part of the signal from the lav's routed to the subs to be technically correct? 90% of the time the subs are just to make the marketing video have a little thump.
