I still don't see the reason. My understanding of a fellowship is an electronic version of, for example, real chess club. I used to be a member of one chess club 10 years ago. There were very good players who participated in local league team tournaments. There were also beginner players who simply wanted to learn how to play. There were almost all kinds of players and I've seen no problem with coexisting these people in one club. Why couldn't it work in fellowships as well?