See, I think the whole problem with DT's post-SDOIT output was the mindset that they were going to explore different genres. Is exploring bad? No!
But DT took "exploring different genres" to mean "we're gonna write songs that are strictly metal," or, "we're gonna write songs that are strictly ballads." BC&SL is so much better than the last three albums because it leaves behind that generic compositional approach and throws all those different ideas into one big soup, where, like on Images and Words, you have songs that just... progress... rather than staying in one spot for their entirety.
Did DT give this style of composing up entirely? No. Octavarium and In The Presence of Enemies have it. And they're also the two best songs on those album-- albums which many find to be quite a cut below the rest of the discography (even though I LOVE Octavarium).
So would I like a DT album with plenty of mellow sections? Sure! It would be a nice change of pace. But do I want an album full of Repentance and Wither? Hell no! I'd rather just see DT continue to write songs that are all over the place again, as they seem to have started to do again with Black Clouds. More A Nightmare to Remembers with beautiful "Beautiful Agony" mid-song interludes. More Tuscanies with soft, uplifting outros that include melodies and instrumentation that
isn't already heard in the first chorus before the 7 minute long heavy riffing and instrumental section.