Slack is an in-company chat product (their slogan is literally “where work happens” [1]) and it was never intended for public groups, which is why all invite automation tools for Slack are third-party. Slack doesn’t want you to use their product as a public chatroom and they try really hard to make that as unattractive as possible.
Given that, “moderation nightmare” is not really a concern for the target audience since if your company needs moderation in its work chat, you have much bigger problems.
