Eh, I think this is just one of those things I don't "get". A 2 second video seems without value to me.
It’s a fun gimmick especially with kids as 2 seconds goes from not seeing you to noticing and lighting up with a smile.
That's what I was picturing. I'm glad my impression isn't far off. Perhaps it's a "you have to use it to understand" sort of thing, but I truly struggle to see the value.
It doesn't matter, though. I don't use iPhones and even if I did, that I don't understand it is meaningless.