And yes, pretty much every application should be opensource and available in checked, protected repository; the windowze approach is utter crap.
Also, funny how you try to use gentoo - an OS with maximum customization; thus maximum questions to be filled out by its owner; and then suddenly you want real life stuff - like what? Getting out of your basement for a walk? Sure you can solve this without migration from gentoo. If you don't need that amount of customization use something full-binary like... Android or OpenSuSe.
So, basically, rework your image to contributor instead of complainer; or go complain in next-next-sandbox
GNU/Linux is not successful on tablets, because there was Nokia and MS killed it (as usual, instead of doing something positive, they destroy or block others); but they missed Google, that forked Linux and did some housework on optimization = Android.
Or do you want Linux+Xorg on tablets with 26 years of back-compatibility? There was OpenMoko and there are some projects like Pandora that give exactly this - google, buy, rant off.