Really? I mean, I've seen it over ten years of usage, and it's never been any other way, so that sounds like a deliberate decision. At the very least, not using internal storage -- when RAM is needed for something else -- is a decision.
Mobile device OS's do not swap to storage because the typical mobile storage is bottom-of-the-barrel eMMC and the wear-and-tear of swapping on the flash would be a killer.
It would only need to do it in the few occasions when the tabs have filled up the available RAM and they're large enough to be worth dumping. iPhones use bottom of the barrel storage?
