Sometimes Hard to Drive Speakers are a Gimmick

So designers simply add more and more networks to their crossover to "correct" for various things, like a frequency response bump or dip or ripple, or to correct phase, correct for floor bounce, etc. because they can do it never mind that such added complexity might take away from the sound quality or make the speaker harder to drive.  I once saw a picture of the crossover for a two-way speaker that had more than a dozen capacitors and something like eight inductors.

You are conflating a complicated network for one deliberately altered to make it hard to drive.  In the case of the Revel, we have actual anecdotal evidence of it being made hard to drive specifically to sell bigger amps.  

Suggest you review the section on the Focal low pass filter. 

Practically not a problem anymore these days as long as people choose the right amp to do it right, which often they do not. 

You have anecdotal evidence for a conspiracy theory?  Wouldn’t it be definitive if someone bought the speaker and analyzed the crossover to confirm that this has been done?

Haven't listened to new speakers in a while, but my old Infinity Column II's are 90db efficient and have 2  10" woofers per cabinet. They get plenty loud!

TL;DR : Don’t be seduced by hard to drive speakers.  They aren’t more musical.

Many of your statements here and there are not valid to begin with, yet you are making a big fuss over them. Who said hard to drive (i.e., lower-impedance) speakers sound more musical? Where did you get that idea?

The sensitivity of the speakers, the crossover design, and the synergy between the amplifier and speakers matter far more for sound characteristics and quality. Additionally, to assess how hard a speaker is to drive more accurately, you need to examine the EDPR curve, which combines not only the traditional impedance but also the phase angle, giving a true measure of how difficult the drivers are to push.