Login and Activation
Signing in
When Remove Username is enabled, the stored username equals the email address. Visitors log in with that email and their password on the standard Joomla login form.
Account activation
Registration Simplifier does not change Users component activation settings. If User Account Activation is set to Self or Admin, new accounts stay blocked until the activation step finishes. That is normal Joomla behaviour.
Password rules
Minimum length and complexity still come from Users > Options. The plugin does not bypass core password validation.