What happens if we don't have Perform or Work?

Its menu items, pages, Today cards, Inbox items and reminders don't show. For example:

• Without Work, there's no Tasks, Projects, Milestones or Calendar, no Tasks tab on phones, and no task figures on Today or in analytics.
• Without Perform, there's no Growth or Recognition, no performance, recognition or probation tab on people's records, and no probation check-ins in the Inbox. Leave still waits for the end of probation.

Nothing is deleted. Add the part again and everything comes back as it was, with anything kept in the meantime, such as new people's probation check-ins.