Megadeth bassist David Ellefson spoke in an interview with Metal Wani and explained what they leard with they latest album Dystopia. He said:
“I think we learned with [2016’s] ‘Dystopia’ that we’re at a point in our career where we can still make really compelling new music, but it’s also important to take our time and really make it as great as we possibly can. And I say that because I came back to the band… I came in [after the] ‘Endgame’  album, which was a really strong album, and there was a sense of renewed urgency and passion when we made the ‘Thirteen’  album.
We were doing the ‘Big Four’ shows, and we only had about 10 weeks to crank this record out, and it was fun, because it sort of hung our feet to the fire and you could feel there was a really good energy about the album and we were all excited because there was big touring behind that — the ‘Mayhem’ tour, ‘Big Four’, all these things. But by the time we got to ‘Super Collider’ , that was an album that wasn’t as focused; it was an album that was done in more of a hurry, there were tour dates booked in the summer. I think we felt boxed in a bit on that album, and suddenly we were making an album on a schedule a second time when we really needed some more time to breathe.
There are some great tracks on it — I’m not discounting it as an album; it’s got some really cool stuff on it — but I just think, as a group, it took its toll on us. And, obviously, as the group sort of dismantled and remounted again for what became ‘Dystopia’, there was a process there that, I think, now with MEGADETH… I think we’re there now, where we’ve recalibrated things to really honor and respect our legacy and know what our fans like. And you don’t just make records only for your fans; you have to make records also for you as the creator of them. But I think it helped sort of recalibrate to us that which is really at the core and heart of MEGADETH.
And there’s some things that we all write that are really, really good, but they are just not right for MEGADETH. And that goes for every one of us in the band. And I think, for me, it’s been helpful to have things like METAL ALLEGIANCE, to have things like me and Frank Bello’s [ANTHRAX] ALTITUDES & ATTITUDE, and there’s a few other outlets on the side, that allow me to express this sort of other tones of my voice that are not MEGADETH. And even METAL ALLEGIANCE — as much as it’s a metal record, it’s not the same.
MEGADETH has a very narrow window of what is MEGADETH and what should be MEGADETH, and I think we found the epicenter of that again on ‘Dystopia’.“
You can watch the entire interview below.