At one time RV.net was THE place to go for Class B discussion. It has since been eclipsed by the many Class B groups on Facebook. Also, another independent forum for Class Bs has grown under new ownership with much increased activity. It really is that simple.
BTW, there is nothing blurry about Class B or B+. Simply think Class B originates from a VAN chassis and a Class B+ originates from a CUTAWAY chassis. You can argue about where you think you belong but no Class B owner wants to hear people coming on this forum putting them down for lack of size, space or bathrooms with separate showers, etc. If you can't handle owning a Class B just remember RV.net has a subforum for you in the Class C forum labeled Class B+.
Also, Class Cs (or B+ if you insist) outsell Class Bs by about 8 to 1. Numbers bear out if discussion is allowed it would quickly no longer be a Class B Camper VAN forum. If you don't believe that look at the semi-competing Sprinter-Source forum where the Unity type Class C talk dominates Sprinter RV discussions and it makes it difficult and confusing to discuss issues that seem generic in nature but not applicable to Class Bs.