Probably because these days it's almost a foregone conclusion that updating will be necessary since board partners no longer think they need to work out all the compatibility issues before releasing a model like they used to do. They figure they'll release as they go, which means often hardware incompatibilities aren't found until the product has been leaving shelves for some time already.
That, and like a lot of people, he may have concerns regarding the Meltdown and Spectre side channel vulnerabilities that they are saying require firmware updates to bolster security against. I for one am not installing the latest firmware against these as I am unwilling to trade off my performance when I already know these are only critical if you...