Yes. Any module you do not plan to use (or at least not for the time being) can be switched off on the Application Modules tab of the Manage Account page.
Why turn off a module in the first place?
It is always recommended to use the entire suite of features in Primalogik but some clients, when they're first getting started, just want their employees to get used to the app first and participate in the first round of surveys or start creating their goals.
They might not necessarily need/want employees to start using everything right away (notice that we disabled Instant Feedback in the example above). We'll turn that back on when we've gone through the first round of reviews and employees are a bit more used to the application.