@RokuNB let's try this again...
I take from the silence that we're a long ways off being able to access the GL rendering layer. Sad, but we can move on.
When I look at the Roku opening sequence, I see a combination of perspective flips and reflections. Coming from the HTML world, we got some pretty powerful tools in the form of the transform and perspective CSS directives:
https://3dtransforms.desandro.com/box-shadow, scale, rotate, duration, easing and a capable gradient function that could be applied to SG nodes would open up extraordinary creative possibilities for Roku apps: carousels are just the most obvious and immediate example.
I don't know how your engineering team decides what features to bring to the platform, nor do I pretend to understand what's hard vs impossible inside of the black box. However, if there's a conversation to be had...