Yep. Find a speaker that dips below 3 Ohms and suddenly they'll appear "discerning" of amplifiers. Same for ESL's.
Don't get me wrong, there are a lot of very easy to drive speakers, thank goodness, which do not require 200 lb monoblocks to drive effortlessly, but the monsters do exist.
I have also personally found deliberately poor crossovers by Focal which deliberately choose to drop the impedance for just this reason.