I see some good explanations and brief discussion of this trend up above me, so I guess I don't have overmuch to say with all of that having been said.
Personally, I don't think BZP can support as many flamewars as before and still remain a nice place (and yes, I realize it doesn't). Like it or not, BIONICLE is fading out for now, and the community here is shrinking - I know, I've been gone plenty myself. I'll be honest: I participated in heated topics back on the old forum, and I think they can add something to the forum, sometimes. With a smaller community and the site trying to streamline, though, we can't afford any leftover bitterness here, especially when the arguments would be over nothing nearly as large.
I welcome arguments, myself, and I argue plenty with my friends. But that doesn't always work, and I'm a little glad there's so many fewer flamewar-type discussions here now... even if it so rarely affects me.