I understand that in order to connect Sales Cloud to Marketing Cloud you need to setup Users in both systems and integrate them in order for data to transfer between systems.
However, outside of these two users, is it okay for all other Users to be created and NOT integrated? I want to confirm that I can have Marketing Cloud Users who don't have a Salesforce licence? Tthey still need to be able to use Salesforce data for all of their usual day-to-day tasks.
Is there any MC functionality that they wouldn't have?
Is there any Salesforce documentation I can quote for this?