Lvl 5 req

You can find the full post of this new rule here: New Rule regarding Joining Funs

In it, Zarpedon suggested that
1) If a team agrees to take on someone(s) who doesn't meet the Level 5 requirement, they're free to do so.
2) If anyone wanted to offer feedback to this rule change, they could do so in that post.

Seeing that your post can be considered a suggestion, though, I don't really mind whether this post is as a new thread, or as a reply in the linked thread.

One suggestion I may offer:
A player wanting to join a team can make note of their level, if they + in. (e.g. if there's an F+2, and someone who's a level 3 Defender wants to join the team as a Defender, then they would say "F+1 if I can lv3 def" (or something to that effect). Then the rest of the team can choose whether or not to have that player on their team, with that role.)

The idea of limiting players who join funs to those who have their role as a Level 5 is understandable. It seems the majority of players prefer to be teamed with those who can perform their roles most efficiently (i.e. Level 5 in a designated role), because Casual BA serves as a compromise between playing with randoms, and speeding. This is what makes teaming with CBA'ers fun for those in it; everyone knows what they're doing (i.e. avoids the "risk" of longer games that would otherwise be played with randoms), as well as not take things too seriously. You could view these two ends (playing with randoms who may not know what to do, and play seriously) as opposite ends of a spectrum, in which anyone in CBA will lie in between. Some may lean towards one side or the other, but most share a balance in which casual games are both "efficient" and "fun".

Another benefit to having this rule, is that people who seek short-term goals (torso/items and/or diaries) should be demotivated from playing with CBA members, who want to play both efficiently and for fun. We've run into numerous cases where someone who joins / has joined CBA has exploited its services for their short-term personal gain, (possibly) left the clan, and advertise it on social media as a means to these "attractive" ends (imagine a post being "oh yeah. I heard the cc 'Casual BA' will help you get your torso or diary pretty fast!"). We want to mitigate this misrepresentation of the clan, by offering modifications to the current system that we feel helps make aware of what we're about (having fun, playing for long-term goals).

Going back to your concern for the new rule change, I definitely agree that there could be a better way to welcome new players who can show potential for long-term interest in BA. It's just hard to discover these people, unless you play with them yourself and see what they're about. (At least, with me, I play almost all my games with randoms to see who I can invite, based on their interests or goals)

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tl;dr
The above is just my personal opinion of your concern, and everyone is entitled to their thoughts and expressing them, so long as it helps the clan grow. If you're unsatisfied with my view, or want additional input, feel free to comment on the aforementioned (linked) post, or PM some of the other stars in-game to see what they'll say!