Hi @daveyf,
I know nothing about Magico’s impedance curve, but generally I think the answer to that question is most audiophiles get turned on by hard to drive speakers for two reasons:
1 - The myth that a speaker that can make the the difference between two amps current capabilities apparent also means the speaker is more resolving of music. It isn’t.
2 - Bragging rights.
To be fair, it really is hard to get enough bass and sensitivity out of your average 2.5 way speaker without a low impedance point, so I can understand how some speaker designs just naturally push this requirement, but I also see some manufacturers who go this route and then discover it’s a selling point.
Best,
E