In my area most everyone has a seller's agent and they work with the buyer's agent. Could you explain why you feel that is not good for the seller? Also in my area some seller's agents have dual agency. That could have problems too.
The term "work with" could mean "let's split the difference just above a low-ball offer and get this deal done before lunch, and I'll pick up the tab." If I hire an agent, either as a buyer or seller, I want that person to get me the best deal possible, no matter how long or how much negotiation it takes. Working with the opposing agent is not the priority. The priority is the best deal for ME and not the agents.