Well, I was talking about complete chemical synthesis of whole RNA strands. And not using RNA polymerases from DNA templates. Nonetheless for protein expression one seldom just uses the mRNA. It is kind of extremely inefficient.
I did not say it was used for that. He wanted to know where RNA "came from" I explained were I comes from a Biological and biotechnological stand points. Personally I don't think I've heard of many uses for synthetic large RNA oglionucleotides