Should I update my iMac?

The current version of macOS is 27.0.1. Based on your post you are running an older version, so the first step is to update your Mac to the current version.

See: Update macOS on Mac - Apple Support

In general, it's a very good idea to keep your Mac updated as recommended by Apple. Updates usually include needed security improvements. Sometimes, that is the major purpose – the 27.0.1 update is mainly a patch for a zero-day exploit thought by Apple to potentially be in the wild.

To be clear, there is a difference between an upgrade and an update. Upgrade means a major version change, e.g. macOS 26 Tahoe to macOS 27 Golden Gate. That is optional, assuming your hardware supports it. An update is within a version, e.g, 27.0 to 27.0.1 or 27.0.1 to 27.2. If you remain on an older version, Apple generally updates those with security patches as needed for several years (in some cases longer, for example Apple earlier this year Apple released point updates for Catalina and Big Sur, versions of macOS that launched in 2019 and 2020, respectively).

DJMc wrote:

Should I update

[Re-Titled by Moderator]

Original Title: Should I update?

The thing about your question is how you interpret all the complaining that happens after any update. If you take to heart some of the comments here you would think macOS becomes useless after any update, was released without testing (nonsense), and other such blathering. Remember that these forums are a hospital. If you walk through a hospital and see only sick people would you assume the entire population is also sick? Of course not.

It is always prudent to apply updates because of bug fixes and security flaw patches.

Update to what? You already show OS27 so you could update to 27.0.1 but that update offers very little change for most users.

To 27.0.1 … ???

Yes.

(as it appears that you’re already running 27.0)