There are no parts of DT12 that make me think, "what were they thinking" or "this is unnecessary".
FAS, Enigma Machine, Enemy Inside (JR solo), IT... all have the "what were they thinking" moments
It should be expected of JR to do the cooky stuff, but really, what's in The Enemy Inside that isn't in, say Scenes from a Memory? If there's one thing that wasn't necessary in Enigma Machine, I guess it would be the slow Tuscany section, but there is absolutely nothing wrong with it.
I don't know, DT12 has so many people divided, I just don't understand. It's a great album, with no filler, goofy vocals, or disco or blatant rip offs. The Looking Glass has the Limelight inspired riff, but it isn't an exact copy, and at least it's an inspiration from a band that doesn't suck, i.e. Muse... Oh excuse me, I mean, a band that I don't care for at all.