I think people don't understand the truly massive undertaking of what that album represented. The sheer musicality of what they did probably took a massive toll on their psyche.
There was just nowhere else to go after that album there was nothing else for them to do they have accomplished it.
I think a lot of people didn't like where Amy Lee took Evanescence after the split with Ben Moody, but I feel like The Open Door is a better album than Fallen overall. It may be less hard rock, but it's more interesting and really showcases her writing talent, while Ben just wanted to be a pop hard rock group without exploring other musical elements (as showcased with his lackluster project We Are the Fallen, which was just Evanescence Light with a less powerful female vocalist).
The last Tool album I enjoyed was Aenima, and even then they were veering into overly-proggy wank. I honestly think they peaked with Undertow, but you know, music is subjective and all that.
Hard disagree on Tool, their sound has definitely evolved over the years but I think that Fear Inoculum is a damn masterpiece. I totally get it though if the more prog rock/experimental style isn't your thing.
I've been unhealthy obsessed with tool since 2001. 10000 days was good and fear inoculum was just more of the same no innovation at all. Lateralus was and is their gran opus.
And the older I get the more and more I realize that Maynard can't sing well.