It seems that extruded also engraves “clear” as opposed to the cloudy effect that cast gets so you can see the engraving - so it’s great if you’re going to do paint fills, or are just cutting, but not so great if you want to see what you’ve done.
I’m actually curious how that would look as an edge lit acrylic. I wonder if the design would suddenly appear or if the light would just pass through it…hmmmmmm