The major issue I’m having in non-shape layer assets is with their ability to nest the shaper layer transform contents, it is creating X and Y parameters for both position and scale with ‘Groups’. It allows you to use expressions without any precomposing. PreComposing breaks all expressions. This can’t be replicated with Nulls because it doesn’t translate and you lose the ‘Morpher’ from DUIK.
It’s a complicated issue and I might not be able to use DUIK as a result.