This doesn't apply to iOS. If new iOS version come out, you should update immediately so you can test if it fit your comfort. If not, you have very limited window to come back to previous major (and hopefully still secure) version of iOS.

If you miss this window, you have two options - stay on older version waiting till new version get fixed all annoying bugs (hello iOS 11), or if you already on newer version, you're screwed - no coming back.

For this reasons I stared upgrading to newer iOS versions as soon as they are available.