There is a reason perfecting ones style and achieving voice takes decades. It is the most subjective of the writing crafts and that makes it the most challenging to teach.
With regard to AI Writer. I got seduced by the syntax highlighting but quickly found the act of using it as a writing tool just didn’t gel with me. Found this to be true of Causality as well. Both are just “odd” to me.
I use IA Writer for the Syntax Highlighting tool. I don’t actually use it to review syntax, but having the colour variety whilst I’m drafting or editing shorter works (<3k-ish) helps me stay focused. It enhances readability for me. Maybe an ADHD thing.
If I’m struggling to stay focused in Scriv I will sometimes take the scene to IA Writer for that reason until I’m back into good flow.
(I also use their fonts in Scrivener)