1. no
2. why not - it's working great
sorry, i'm being un fair...
i run quite a few linux boxen, servers, desktops, laptops. whenever i upgrade, i run the risk of regression, that is, something that used to work does not work the same way or at all (see my other posting about the TB3 fiasco, or quemu/winxp/ie that started blue screening after i fully updated a machine) constantly updating and testing all my machines won't leave me much time for other things...
so generally, i stick to the rule of if it ain't broke, don't fix it...