Cute mascot!
Whenever ECS is brought up, I just can't think of a game I'd make where the pros outweigh the cons. I've come to the conclusion that I just don't understand it yet, so I'd love it if someone who's as passionate as you clearly are, could impart some of the things that made you fall in love with it.
Of all the reasons to hate these messaging apps, it's because messages last forever? I'd get it if you were concerned that private companies don't really delete your messages, but you know the average person using these apps actually does want their messages to last?