Are integrated amps technically better than separates?

I remember owning a Luxman integrated back in the day. Sounded way ahead of the competition, and beautiful to look at!

Define "back in the day", please. When are you talking about, archison?

It’s so interesting that folks think they need a high quality power chord and expensive interconnects. Never mind that just inside the wall is the cheapest copper lines the contractor could buy. It’s laughable. Just inside your loudspeaker is usually a thin generic cable connection between the crossover and drivers. 
You need expensive cables because it makes you feel better. 

Led Zeppelin had high quality power chords. 😬

It’s so interesting that folks think they need a high quality power chord and expensive interconnects. Never mind that just inside the wall is the cheapest copper lines the contractor could buy.

If you are suggesting that a power cord does not obey Ohm's Law... Ohm's Law isn't like a speed limit; it can't be broken. By comparison, the solid core wiring in the wall is fairly high performance in terms of voltage drops along its length compared to a power cord, but it is illegal to use Romex or the like for power cords. The effect of the power cord is measurable and with relatively unsophisticated instruments. So the onus is on you to explain why they can't have an effect.

I've seen power cords rob a 140 watt amp of 40 watts of its output power. If you are suggesting that is not audible as well... sheesh! Its pretty laughable.