I kinda agree, but with only about 2-3 in most of the classes, the interactions would fall a bit flat I think.

I'd be fine if it was like 2 classes at most, but four would just make the RP a bit confusing since people in four different classes would interact with each other.

For example, lets say everyone was in class, four different classes. They interact and now the rp is weirdly messy since interactions are happening in four different areas.