I am sure it will become very clear what they can be used for when it’s released, as I am planning to create content examples with specific usage cases 
but very much capable of being used for production, in terms of roughing out they could be useful for look development too. but you could just use basic materials for that. it has use cases that defy what unreal can easily do, like magical effects, pearlescence, iridescence, and other uses I’ll try highlighting in my project
Here is a clear example of SEM compared to VAR
you’ll notice VAR wraps around once, as highlighted you can see the centre color on the backside when towards the screen’s edge.
here’s a teaser, not organized yet
