How updating all your packages at once is a good idea?

After a year of using Nix for managing my personal macOS laptop, I started to notice one annoying pattern, and that is updating specific packages that I was interested in. Everything in Nix came from a single source, which is Nix packages. And while the flake lock pins everything to specific versions, I can’t update specific packages to the latest version that I’m interested in. I am forced to pull a new version of all the packages from Nix packages. How is this a good idea? I’m used to get in...