I guess the thing with Pogba's value is that it is a world record, and easily the most expensive midfielder. The expectation that generates is that he should be world class right now, even accounting for the fact that a handful of top players would just not be for sale for any price. Is he really worth that much more than Kante, Xhaka, or Gundogan, just to pick 3 other mids who all went for less than half his price in the current window? In footballing terms alone I would say no, but from a marketing/business perspective then maybe. The idea of the world's most expensive player being worth it for business, not football reasons inevitably leaves a bit of a bitter taste behind.
The transfer window is part of the show for me. It's like the Weigh-in before a big boxing bout or a curtain raiser - the economics, the fighting for players, the will-he, won't-he is all part of the 3 ring circus. United are on the trapeze without a net at the moment - it's exciting, thrilling but you kind of want to see someone fall as well. (Edit: I don't really want to see a circus performer fall but you get my point...)