To Update or Not To Update.
According to Apple: Keep your Mac up to date.
Periodically, Apple releases updates to your macOS software. These can include updates to apps that come with your Mac and important security updates. If you receive a notification that software updates are available, you can choose when to install the updates, or choose to be reminded the next day. You can also check for macOS updates manually in the Software Update pane of System Preferences. To check for updates to software you’ve downloaded from the App Store, open the App Store. https://support.apple.com/guide/mac-help/get-macos-updates-mchlpx1065/mac
What if I’m on a Windows computer you ask? Well PC World has this to say:
Yes, It’s absolutely necessary to update Windows.
The vast majority of updates (which arrive on your system courtesy of the Windows Update tool) deal with security. Microsoft routinely patches newly discovered holes, adds malware definitions to its Windows Defender and Security Essentials utilities, bolsters Office security, and so on. And don't forget the occasional Windows hotfix, which may address serious issues such as random system lockups.
In other words, yes, it's absolutely necessary to update Windows. But it's not necessary for Windows to nag you about it every time.
Typically your IT Provider will communicate to you when you need to run updates or they will update them for you in the background, but as a general rule - it is a good idea to run updates from Apple and Microsoft to keep your devices running smoothly.