Thank you!
I would say it’s important to make the distinction between what does the protocol allow and what is allowed in public transaction pool. Our aim is to make the protocol maximally flexible, but start small and carefully expand what the public tx pool will allow.
Concretely to your question: full state access before the payer is approved in this proposal, however, you will need to find a builder who will include such a transaction. Our goal is to support self-sponsored transactions in the beginning and over time allow sponsor transactions (or other variants that gain popularity).