Dynamic Content user accounts now have "just in time provisioning", allowing you to set permissions as you create Dynamic Content user accounts, to provide users with immediate access once their accounts are created.
To remove the time pressure of having to manually set permissions for each new user as soon as their account is created, you can assign initial roles ahead of time as you set up user accounts.
Depending on your organization, you might want to provide initial roles that give new users sufficient permissions to get started, and then revisit them. Alternatively, you can assign roles that are suitable from the start.
Read more in the Just in time user provisioning release note.