I don't doubt the explanation but agree it doesn't totally make sense: an !important-set font-size is not really any more "guaranteed" than another one, as it c

I don't doubt the explanation but agree it doesn't totally make sense: an !important-set font-size is not really any more "guaranteed" than another one, as it can just be overridden with another more-specific or later-appearing !important style. So you still have to look at all the styles to be sure you're complying, and if you're going to do that then you might as well just not use !important at all. Though I'll admit that once you have your "mandatory" size style as !important you'd only have to look at the other !important ones to be sure, so there's something to it. Of course there's lots of perfectly reasonable uses of !important now: dealing with other peoples' uses of !important.