You can update your version of Fedora through the updater software as well but it’s a very clear separate process that is initiated manually.
Distro version updates bring major updates to key packages - the one you’d notice most would be to Gnome, the desktop environment. There will be other things too that get only bugfix and security updates during the life of that version, and then after a while that version will lose support and you won’t get any updates at all (https://docs.fedoraproject.org/en-US/releases/lifecycle/).
Updating is very safe and reliable. I’ve had my Fedora install at work for 3 years, updating periodically and it’s working extremely well.
There’s a massive cultural thing in the US about the iPhone being the preferred phone and if you don’t have one it must be because you’re too poor to afford one. Obviously this is a result of marketing and isn’t universal but it is a surprisingly widely held view.
Given that, showing up in a group chat as a lone blue bubble marks you out as the inferior group member (in some people’s eyes). It doesn’t matter so much 1:1 but if there are 10 people the odd one out stands out.