This is just my opinion, full of conjecture, with no cited sources, and based on no facts at all, is that the WT team may be to busy working on sim wide avionics to focus on long term development of the CJ4. I think in time the CRJ will become more true to life, unless the CJ4 attracts more quality volunteer developers.
Also bizjetz are kind of niche in flight simulation where as airliners have a larger following.
I like them both as they seem to sit in the middle between complex GA aircraft and full featured modern airliners.
I think the CJ4 is a bit more newcomer friendly to those new to jets with the CRJ being closer in complexity to an larger airliner.
Again this is, just like, my opinion, man.