The most common reasons for plugin updates are security updates, bug fixes, and new features.
It may be necessary to update a plugin if you are having problems with it or want new features. Remember, though, that updating can cause things to change or even break, requiring further development work.
You are covered on the security side of things with Strattic, as your WordPress website is hosted in a secure, dedicated container that can only be accessed by your team members, and it automatically shuts down when not in use. When you generate the static version of your WordPress site, any security vulnerabilities will be left behind.