Honestly earlier in the band's career, I felt sometimes there was a minute or two of trading solos in a given track when it didn't really serve the purpose of the song. The self-titled has by far the most of this, and it steadily decreases over time in the discography into PL, which still has extremely strong solo action, but has much less of that original jazz/prog influence. I get what you guys are saying there. Personally my opinion is that the band matured as songwriters and found ways to make every part work more for the song. For me, the part starting at 3:40 in "Seven" is one of my favorite parts of the album, and sure, it does sound a bit more generic power metal, but it's also fiercer than most of what Symphony X has done before and has an attitude I really like. It's not a "ok time to trade solos for a minute" part, but rather a section that keeps you right in the development of the song and manages to add to the intensity with an instrumental section.
But it seems people really do miss those extended blocks of guitar solo -> keyboard solo -> guitar solo -> keyboard solo. I mean, you have one right there in the first main track of PL, but I get what you guys are saying. There really is no more stuff like 3:27-4:00 like on Winter's Dream Part 2. I guess I just don't really miss that element of prog influence that much. /shrug