Sometimes Hard to Drive Speakers are a Gimmick

I think designers are unconcerned because, as Dave and Troy said above, electronics capable of driving such speakers are common.  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.

I tend to like low powered tube amps more than any other kind of amplification, so efficient, easy to drive matter a lot to me.  But, people like me are in the minority.  Most people want high powered amps that can drive punishing loads.

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!