I can't speak to Sherlock Holmes, but Season 3 of Black Mirror is extraordinary. Nosedive could have been edited down substantially, but so could White Christmas or Fifteen Million Merits from the seasons before. I don't agree at all that there was any Netflix degradation.

Abstract is triple-A. A Chef's Table is triple-A. Stranger Things is triple-A.

We all have a sort of cynical habit of presuming that things once were good, and now they aren't. But Netflix has always been a mix of good and bad original content, especially when viewed from the subjective eye that what some of us think is great others think is terrible. They're trying to serve all markets.