Yeah, basically. Speeds up new installations, less duplicate downloads. Not interesting at all if you're updating regularly, which most people are.

There are some bug fixes that are relevant for installs and base images. For example, security update in GPG is probably not a big deal for you but might be for someone building and pushing things from these.
Kernel, firmware and microcode updates might only affect a small minority of users depending on hardware.

This whole thread seems to be unaware about Debian.... so I'll give an actual answer.

Debian only actually updates their software packages every 2 years, this is for stability purposes. However you still need to fix some severe bugs so about every 2-3 months Debian does point releases that are only updating for security fixes. This is one of them.

When Debian 14 actually releases it will upgrade nearly all of the packages that are in your base system.