The overhead for requiring approvals is far to high, even for new users and frankly the issue is not restricted to new users.
Converting to messages is also very cumbersome.
This cannot be a unique problem. Groups is impractical for large forums and small mod teams.
All we need is a “request edit” option for flags that can send a generic or custom message and hides the topic, ideally allowing them to resubmit after an edit.
Your AI composer is also part of the issue. It creates long winded over structured topics. The process for reigning that in is also cumbersome needing custom agents and not being able to tune existing ones.