I wonder if styling your text (like in caps) has become more important than it used to be because we have reached the tipping point in communications - sending texts and emails instead of voice-to-voice. And since sending texts and emails has become more the norm, it's become more important to have ways to express emotion in the words. This wasn't so important when we actually spoke to people, but we all know that it's too easy to read something into the text that might not have intended to be there. I'm betting that by the time my little grandsons enter adulthood, there will be lots of 'etiquette' rules that we, who used to actually speak to people, will have to learn to adapt to. Just my humble opinion. Or JMHO, like they say nowadays.