I think the PM limit for new users is not an indication of a bad community or any deficiency on WHMCS part. It's quite normal to have limits like this to reduce the likelihood of a spammer joining a forum and then spamming users.
█ The Complete Client Management, Billing & Support Solution
the best way is to make an easy documentations, because i am novice in whmcs and i can't do anything i didn't find what i need in the documentation or when i find the documentation about what i need, there no important details.
And therefore disappointing.