We should reject hard-to-drive speakers more often

This is a bit ridiculous and I assume clic bait. Get what you like and enjoy the music. It does not have to be complicated. Hard to drive speakers require more power, more current. There are high quality amps that can do this???

Hard to drive speaker requires big macho amplifier.

Hard to process software programs require more powerful processors.

More to buy, more to sell, more ka-ching.

As the Byrds (almost) sang,

To everything, churn, churn, churn.

There is a profit, churn, churn, churn.

@fikki: The MG3.6 can easily be bi-amped (unlike the series-crossover .7 series Maggies, the .6’s have parallel crossovers). Use a brute amp on the bass drivers, your D-70 on the midrange/tweeters. In almost all loudspeakers, the majority of the power goes to the woofers. Take the bass out of your amp (with a high-pass filter), and you will then have far more power for the mids and highs.

I think you should FIRST try very hard to find efficient speakers you really want, without even listening to inefficent speakers. Don’t even look sideways at them.

Next: listen to whatever appeals to you, even if low efficiency, KNOWING, power needs will go up accordingly.

So, find a low efficiency speaker you truly want? The best efficent ones you found would be a true compromise?

Forget compromise if you can afford it.

.............

IF the difference is slight, then think long: efficient = less power needed = same benefits as listed below, but now also easier to try tubes= less cost; less heat; smaller; easier placement .... add all those benefits to the speakers, combined a great sounding choice? If tubes, less tubes, less replacement/rolling cost ....