Most businesses in the state I live in, as well as the states around me (what someone in SF or NY would call flyover) are handled by a registered agent (trivial, not even in a fee to become an agent in most states, just a valid local address) or the owner.

tbh I still don't understand why anyone bothers paying anyone or anything to do the paperwork, it's not like Federal taxes

Why would you pay someone to do Federal Taxes? Are they difficult to do in the US?