DT has had issues with how their albums sounded as far back as 1999 (Scenes sounds mostly great, but there are at times where it could have sounded better), so it's not like their issues with sound was a new thing that kicked in post-2010. Note that I am talking the overall sound, not the drum sound. DT has definitely been a victim of the loudness wars, as have many other great bands. Heck, Rush's last few albums had major sound issues as well (relative to their albums in the 70's, 80's and 90's).
Look, you either have an interest in being fair or you don't. We've got pages and pages on the so-called passive-aggressiveness. The band DID say this in specific response to questions about the rotating setlists, the special sets, the repeated QA's, the at-the-time vibrant personal website, the Ytsejam stuff, the behind the scenes stuff, the DVD bonus features, etc. etc. Snark all you want, only a small fraction of this was (or is being) done.
I clearly said it wasn't definitive, but it was a point that had to be acknowledged.
I would imagine that it is clear that the band doesn't think certain things are necessary, which is why they aren't being done anymore. Rotating set lists is a good example, as they have made it clear that a mostly static set list is their current preference lately, so they are going that route. As for special sets, no, they don't bust one random special set in the middle of a tour, but have smartly chucked the cover sets, and they have done a great job overall with the set lists in the Mangini era, from finally playing Space Dye Vest every night for an entire tour (as opposed to just one night, which you know would have been the case had it been played when Portnoy was in the band), to playing Don't Look Past Me (a big time obscure demo) at a dozen shows or so, to doing various anniversary sets for entire tours (all of Images and Words, all of Scenes, doing a chronological set featuring a song from every album), etc. I could go on and on, but I know, I know, every time it is pointed out the many great things the band has done this decade, a Portnoy fan always points to something they haven't. "Great, they have done a-x, but what about y and z??"
Don't get me wrong, as good as 2011-2019 has been for the band in my estimation, I am in the camp of those who feel that DT will never equal or top their peak of 1992-2002, and I also prefer Portnoy as a drummer over Mangini. Mangini's drumming might be better on a technical level, but it's a bit too stiff for me at times, and as I have said for years, as a professional air drummer

, Portnoy's style, to me, is just more fun. So, even though I think all four Mangini albums are better than the last three they did with Portnoy, I am not one of those "Portnoy bad/Mangini good" people. This decade has just been a lot more fun as a fan than it was the last half decade with Portnoy. Remember that outtake video we got with JLB and Petrucci? We never would have gotten that in the 00's, because Portnoy had to dominate nearly every interview or promo with his overbearing personality, which got more and more grating over time. I think most of us would agree that Dream Theater is either in the home stretch, or fast approaching it, and it's nice to see the band happy and the personalities of all of the members being allowed to shine and everyone just enjoying what they are doing now without any drama or any one member feeling like he has to always be the face of the band or the center of attention.