Also, I think Roine has taken the online chatter about their double albums being too padded to heart too much, and I think that is why he made the last two albums one-disc regular releases (with a bonus disc). And both of those albums aren't like The Sum of No Evil, where the bonus tracks were all just okay; the bonus disc from both Banks of Eden and Desolation Rose have some of the strongest material from either record. But I think the criticism made Roine, who doesn't always react well to stinging criticism, even if he does take it to heart, go for more concise, single releases.
Look at Desolation Rose again: all of those really cool instrumentals were seemingly just thrown on the bonus disc, while the main disc does not have a single instrumental. That is quite a contrast to an album like Stardust We Are, which has a 20-minute stretch on Disc 1 where there is nothing but instrumentals (four straight, with one being an intro to another, two regular-type instrumentals, and then a short transitional instrumental). That kind of stretching out made an album like Stardust We Are that much more awesome, as it is very sprawling in scope.