One thing I'd add to this: being able to pretend you're someone else.
This concept brings the old "on the internet, nobody knows you're a dog" idea [1] to video conferencing too, which could be extremely useful in some situations.
For example, imagine the target of harassment or persecution being able to express emotions visually without revealing identity. Or someone in witness protection. Or an undercover journalist in a compromising situation.
Of course, on the flip side, this tech could be used for evil too.
[1]: https://en.wikipedia.org/wiki/On_the_Internet,_nobody_knows_...
