Updates...opposite approaches, both failing
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Google's promise now is that if only I bought a fifth tablet, they would really, really, for real this time, pinky swear, keep it up to date?
Yeah I can, I am not some android supporter just an Android Dev who just keeps an eye out for the latest news. BTW if you really want that 4th tablet to use (put on the kitchen shelf) you could either update with the available ROMs (as suggested by @wartickler) or write your own weather app. Though I should warn you if it is a pre lollipop tablet you may run into non availability of TLS Version compatibility issue which may or may not be fixable. Till kitkat they are fixable! Before them, I have no idea.
Locked down ROM. I've spent quite a bit of time investigating that years ago but gave up (it's really not a popular name - I forget exactly what it is, it's been sitting in a drawer for years). As I don't have much of an interest in writing Android apps at this point, writing my own app would be a terrible use of my time - these days, I can barely convince myself to write Windows code in my spare time.