Why the facination with integrated amps?


I don’t get it. Is it the manufacturers spotting a trend with the tail wagging the dog or does a significant market segment truly prefer the idea of an integrated?
Pros;
Less space
One less set of IC’s
In theory-one less chassis/case to pay for
Shorter signal paths possible
Can combine transformer/cap function
Cons;
Power supply interference/spuriae
Reduced Flexibility-can’t switch amp or preamp as easily or go to monoblocs
Less resonance control
Long history of lesser performance per measurements and long-term subjective listening
Less resale value if it turns out to be a fad
Less liklihood of an extremely high performing active preamp

I freely admit I am a skeptic. The industry-like so many others-looks for new market niches to move product. 
FWIW, the only integrateds I myself would care to audition would be from Esoteric and Luxman who have a long history of designing no-compromise (low-compromise) high-end integrateds. 

128x128fsonicsmith
The future is in one box wonders with dac, room correction, DSP functions, streaming, pre and amp all in one box.  Short signal paths and built in synergy are huge upsides.  Advances in DSP, Class D and digital are bringing a whole new world of lightweight  and terrific sounding gear.  Separates are not the future and sales will continue to decline. That pretty much sums it up in a couple of sentences. 
The answer to your question is in the way its asked. All your pros are technical considerations, nothing about sound quality. Then the cons are also all technical, except for "long term subjective listening" which the giveaway there is "subjective". Nobody says "subjective" except to be derogatory, further adding to the obvious bias.

You like the technical stuff, be proud and open and honest about being a technophile. Own it. Just don't try and kid a kidder. I've shopped and compared and lived with both integrateds and separates long enough to know that if all you care about is sound quality for value you simply cannot touch a good integrated with separates for anything resembling the same amount of money.