I agree. I feel like the 4b forum doesn't get as many replies so people tend to post their questions where they're going to get the most replies. I've even seen 2s and 3s posting questions in the 4a forum for that reason!
I also think 4bs are less likely to go and stay natural. When you first start out, it's really hard to maintain moisture and because it's not "good hair" you're going to (probably) face a lot of negative feedback from friends and family and that can wear you down very quickly.