Does passwd rely on it as well? I'm curious to it's benefits, and what we're it's original use cases.
Is it a necessary component of multi-user systems?
Consider reviewing odoo, I last looked at them when they were known as openERP, I know one guy that runs it and is happy. It might be a bit much if you just want a CRM...
Noo they made great YouTube videos! https://youtu.be/CcMnf86n8_U