This is not true for all hardware configurations or true for all packages combination(including weird AUR ones) in the world. For sure if we Google if this really happens in the real world you will see that indeed update break things.
Also keeping up with upstream does not mean you only get the new features but also the new bugs, especially if you were using GNOME3 a fee years back at each new GNOME release the forums and reddit was filled with new memory leaks issue, new plugin/extension breakage issues and even GNOME not starting up.
