Ungortunately you seem to keep on ignoring an even simpler point that not everyone uses the phone like you and expects or wants things to work the same way. While perhaps notanu people write full sentences in capital letters often, there can easily be plenty who write more than one word in capital letters at a time, perhaps not all the time or even often, but enough nonetheless. There's nothing you can point out that would prove otherwise. Saying it's common sense or something like that isn't prove in any way, as things of this nature--what people do and their own ways of doing things--are just not related to common sense in many ways. And, even if somehow more people don't write much in capital letters, it can't really be said that they would find caps lock turning off on its own strange/confusing--they write they same way on a computer where caps lock wouldn't change on its own so it can easily be worse for them to have this inconsistency than it is to have some sort of benefit that they might not care about anyway. Again, it might be better for you, but it doesn't mean anything for anyone else, especially in a case like this when one behavior is actually more correct and appropriate than the other (despite the incorrect one being somewhat more convenient for you and possibly some others).
Having said all that, as has been shown, this wasn't the behavior before, which kind of closes it all down. Just becuse you incorrectly remember it or your phone was word, only means that none of this really applies to others and there's nothing to complain (and certainly exaggerate).