If Mangini could travel through time, he would have decided to play as sloppy as hell in DT so he wouldn't be accused of being robotic . . .
That misses the point; it's not about "sloppy" even a little bit (at least for me). Let's not distort the narrative here to where Mike Portnoy is like Lars Ulrich or something. And it's not just one interpretation of "robotic". For me, someone that didn't like his work with DT as much as I do Portnoy's, it was about something more intangible. Granted, I'm not a drummer, but I still can't tap out the intro to "Bird On A Wire" (Neal Morse Band) but that is just PERFECT for that song and it's one of my NMB favorites. There are plenty of Portnoy parts in DT that are structured, measured, not sloppy... and perfect for the song. I can count too many times where I'm listening to DT and think "why are those 87 drum hits there?!?"
I've said this before and I"ll say it again, Portnoy has a knack for playing in 47/13 time and making it sound like 4/4, and Mangini has a knack for playing in 4/4 and making it sound like 47/13. It's all a matter of taste, for sure, but I prefer the former.
None of this is to say that Mangini sucks, or Portnoy is the "better" drummer, or takes anything away from Mangini as a man or a band mate. From everything I've ever heard, he's an amazing guy. You can be all those things and still not be right for the situation you're in. I'm an amazing guy, too, but I'm not a good fit for Primus in any capacity.