Opting out of Canvas Conversations (Inbox) does not mean that you will never receive Canvas messages. Rather, it redirects the messages that are sent within Canvas to your preferred external email, e.g., your @fsu.edu address. This way, you only need to check your email for course messages instead of needed to go into Canvas.
This is different from getting email notifications because the actual message is sent directly to your preferred email.
Please note: it is still important for you to verify that your Canvas notifications are set up appropriately before you opt out of Canvas Conversations or you may miss some messages.