My theory on the momentum:
Four of the album's six songs are very heavy and very epic. Beyond This Life is over 10 minutes long. On an album like DT12, which never relents, this is okay. But Scenes starts with Regression, a very soft song. It sets up an emotional expectation for a lot of modulation. By the time you get to THE, you think "finally, some relief from all the insanity." And then it throws Home, the centerpiece of the album, right after it. And then the insanity of TDOE. Then the epic OLT. Then the epic TSCO. Then the grand finale.
You keep wanting some room to breathe and it never happens. And then it's over.
Okay. but you have to look at the moments within the songs.
Through My Words might only be a little over a minute, but when you factor in the opening of Fatal Tragedy continuing that mellow vibe before the whole band kicks back in, that is nearly two minutes of "come down" after the bombastic Overture 1928 and rocking Strange Deja Vu.
While Beyond This Life is a heavy song per se, it has some wonderful mellow moments, like the first chorus ("Our deeds have traveled..."), which we hear several times.
It's not like it is non-stop rocking intensity from the beginning of Overture 1928 to the end of Beyond This Life.
Plus, Home's first 100 seconds are extremely mellow, and then you have the slow, mellow build-up in the middle prior to the solos.