Actually, even though I think doing it was a misstep, the abrupt ending doesn't bother me either. As I have mentioned before, the instrumental section that kicks in around the 21-22 minute mark is the issue for me. The first 21+ minutes of the song is pretty much perfect, but then we can get that random instrumental section, and even though the song transitions back to the main theme for the climax, it feels like the song never really gets back the momentum it had been building for over 20 minutes. The climax is still really good (that's what she said), but it just doesn't feel as natural due to the several minute of randomness that preceded it. Prog can sometimes eat itself, and that feels like one of those "throwing everything in there including the kitchen sink worked against the song" moments.