This is tautological. If you would like to rant, just rant. Talking about some mystical quality that makes things turn out well is circular.

I'm not sure why the quality I'm talking about is so "mystical", when hundreds of thousands of people on social media seem to have it just fine (given their reaction to the redesign), as well as pretty much anyone who talks about the Snapchat UI.

Maybe the problem isn't with my rant, but that somehow the people running that company do indeed not know what they're doing?

I'm afraid you keep missing my point. If you have some specific question about it, feel free to ask it. But I don't feel like me giving another explanation will move things along, so if you're content not to understand it, that's fine by me.