SaaS allows for scale with multiple account creation 24/7 (ads, referrals, and affiliates promoting). Having a native feature that automatically restricts User Permissions based on the subscription they choose (basic, premium, etc) just makes sense.
Having new customers see things/sections that they don't need and will be restricted from seeing makes the SaaS process messy and manual. There are 3rd parties that charge for this when SaaS account creation should allow for automatic restrictions in line with agency configuration.
A snapshot-like feature for User Permissions could be a fix.