Aside from that, if the Jedi Order is a failure and all the Jedi are dicks from the very beginning of the saga, then how could their complete destruction at the hands of the Empire and Vader have any sort of impact or significance?
It’s about the Sith striking after the Jedi had fallen into decadence. The idea here is that the Jedi aren’t fundamentally bad, but that they had become bad over centuries.