I also think there's a generation of people for who the prequels were their entrance into Star Wars so they look at those movies differently than those who got into Star Wars with the OT. Plus I think the further away from something we get there's not as much emotion involved and we can look at things a little more objectively. I know I was one of those who was disappointed and bitched about the prequels back in the mid-to-late 2000s. I eventually grew to appreciate what story Lucas was trying to tell. By no means am I saying the prequels are actually well written, acted, and/or directed, but I can at least respect what he was trying to do.
And I'm not saying that in 20 years the sequels will have a similar softening of the vitriol surrounding them. Unlike the prequels I don't think there is a good underlying story, mainly because of the hot potato nature they chose with their directors. I think there was an interesting story to tell with the "Rey is nobody" thing they set up in TFA, but then they went the idiotic Palpatine route instead. There was an interesting story to be told with Finn, but then they basically did nothing with him. With the prequels there was at least a connectivity because it was all Lucas. That doesn't mean it was all good, but at least it actually felt like a trilogy.