You're welcome, Knowingthis.
Let me start by saying how much I appreciate your response concerning the updates for QuickBooks Desktop
Installing critical updates will apply some changes to the database. You might encounter some unusual or unexpected behaviors while using the program if you don't install them.
The security updates you'll be getting aren't limited to a specific topic only. I recommend enabling Automatic Update for you to determine what this includes on your QuickBooks program.
For the detailed information about the updates, I'm adding an article below that includes the previous patches of the 2016 version:
You can keep in touch with me here should you have any additional questions or concerns. I want to make sure you're taken care of.