Are integrated amps technically better than separates?

Monoblocks beside the speakers with real short speaker cables, separate power supplies that minimize modulation from the other channel’s power supply sag on demand, separate circuits that minimize interference from the other channel’s electronics etc. Better imaging and soundstaging, and better stability and coherence of the music all round.

     I agree that an integrated, theoretically, has an advantage over separates.  Not long ago, I heard a Levinson 5805 integrated playing through a pair of Magico A3 speakers at a local dealer.  I fell in love with the sound from the mids on up and the holographic sound stage illusion.
     I use separates but this demo sounded so good to me that I was actually seriously considering trying the 5805 in my system and Magnepans to see if it would provide these same qualities.  The dealer suggested a used Levinson 326S preamp that was just traded in, basically the same preamp section the 5805 contains internally, would provide what I wanted.  
     I was a bit skeptical, tried it anyway, he was exactly right and I bought it.  My main point is to suggest you not discount the benefit of flexibility that separates offer. I'm using the 326S stock pc and the balanced xlr cables I use are decent but nothing extravagant.

Tim
   

Ditching the preamp may, but certainly is not, an assurance of superior sound. Soundstage and tonality may suffer without a preamp. But, of course, apart from actual comparison the responses are generalities that can be overturned in any comparison. 

Tim, you may wish to consider upgrading the 3.7i jumpers, and the power cord(s) and XLR. I would guess Magenpan might frown on the jumper replacement, and of course it would be "do at your own risk", however there is discussion of it to be found. 

These would improve the performance significantly. :)

Regarding the jumpers for the speakers, refer to my review of the Maggie .7 at Dagogo.com

A preamp and amp sharing the same power supply in the same box is inherently problematic but that doesn't mean some integrateds won't sound better than some separates - in fact they often will at lower price points.  To generalize though, separates have the advantage by design.