Orb,
I agree with you. As long as you find appropriate gear (and not only amplification, as Magicos will show any deficiencies downstream).
The Q3, the model I'm more familiar with, that I've owned for many years. And now, of course, I have YG and I sell them too. I've followed the introduction of the recent models, and I'm very familiar with them. So you can say I'm deeply familiar with both brands.
I can *safely* say cannata is flat out wrong, at least when it comes to YG's current products. All 3 products in the current YG lineup play loud, with no distortion/no fatigue. At a recent event we had in our store, we cranked a BD of Thielemann conducting Beethoven 9. Very good recording, no compression, playing straight off the BD, with the MSB UMT transport. I'll dare say we reached concert level volumes in our large room, with YG Sonja 1.3 and D'Agostino monoblocs. Not only there was no fatigue whatsoever (we played the entire piece, from start to finish), but instead of being repulsed by the loud volume, the entire store drifted towards the big room when the 4th movement began. And even at the crazy high volumes, we could still talk to (and understand) each other. That's what a very low distortion speaker does.
One person in attendance, who owns big Wilson speakers (and who actually brought that particular BD disc to audition the YGs), remarked that he could never reach that kind of overall performance, at the volumes we were playing.
And our room has next to no acoustic treatment, so we were really listening to the room+speakers.
IMHO, with this level of speakers, and these two brands in particular, you'll only get fatigue if you partner them with unsuitable gear. The speakers are not inherently fatiguing, unlike some others.
cheers,
alex