The owner is unique and the only one who can transfer the company. Admins get everything else. Managers run teams, campaigns and leads for their teams. Sales work the leads of their teams, and run campaigns too. Accounting sees money and volumes.
Accounting does not reach leads at all: not the screen, not the export, not the contact details. Invoicing needs none of the three. That is GDPR data minimisation applied by design, not a switch you can flip.