1. If Oda hadn't expanded beyond Rayleigh's explanation, that's what it would be, but he did expand, and CoC therefore is a superior version of CoA that makes the latter feel obsolete. He could've made it so CoC Infusion required CoA Imbuement and/or Emission, but it is what is.
2. Sure, but basic Haki doesn't let you see the future. imo, those abilities rarely add anything worthwhile to fiction. I'd rather it to be exclusive to a specific person or two than something the uber strong can potentially unlock.
3. I responded because you owned yourself. You're not the first person to cope with AI in this thread.