I don’t disagree but they do exist and it would be nice if amps existed to power them that don’t single-handedly contribute to global warming
It is not that simple. Just because an amp will drive a low resistance on a workbench, does not mean it will not blow up driving a speakers of the same numerical impedance rating, not at all.
The reason is that in a resistive load current and voltage are always in phase. But current and voltage are vectors and have direction as well as magnitude. So it becomes apples to oranges with resistance to impedance and factoring in phase.
So you can not look at impedance without looking a the phase angles. The reason is that currents can, and likely will be much higher at times than into the resistive test bench load. A real red flag is if the impedance drops below the DC resistance of the VC. That is a real amp buster, as there is certainly resonance going on.
I few years back, I spent an interesting afternoon with Billy Woodman, owner of ATC, at his works in the beautiful Gloucestershire countryside, wide of Stroud. He showed me how these low impedances and negative phase angles are amp busters, and yes all amps.
Now I don't design speakers that are potentially lethal to amps. Not only that but the bass will be poor quality bass.
As I have said before, I design for reliability in my systems. That is probably the most difficult task of all.
The bottom line is that if you see a speaker with and impedance dips down below 3 ohms associated with a phase angle greater than 45 degrees negative, then leave that speaker in the store.