Good point Rev,
I'm new too, and found exactly the same thing.
It is often intimidating to jump into a 20+ page thread. On one hand, you feel like you have something to contribute, but on the other hand you feel obligated to read all previous posts to avoid being redundant.
Seems like there is some merit in "starting fresh" at some point, although I completely understand the desire to limit duplicate topics.
Regarding the "sluggishness", I find the opposite. I am constantly feeling like there's not enough time to weigh in on so many topics and read the many quality discussions that are going on.
If what I've seen in the past 2 weeks is sluggish, I'd hate (or love) to see what lively looks like around here!