Back to the original list, some seriously good stuff in there, a few I haven't seen and a few that are OK at best.
Mrs Maisel is the one obvious omission for me within the criteria they appear to have applied.
However, as others have said, US-centric and only Twin Peaks (too low) representing the fully pre 2000 category.
Thus, for the US, no Lonesome Dove, Shogun (the one with Richard Chamberlain), Centennial, Twilight Zone, NYPD Blue, Hill Street Blues, or Washington: Behind Closed Doors (just the ones I can think of).
From us, no I Claudius, Jewel in the Crown, Edge of Darkness, Fawlty Towers, Brideshead or State of Play (again, just the ones I can think of).
And what of kids shows like Sesame Street, Blue Peter and The Teletubbies?
Or the Simpsons?