Yeah, I also support "keep it simple".
There are a ton of autoplay options that are theoretically possible, but at some point you move away from simply providing convenience, and you move into the game actually playing itself. "If I only have two actions in hand, and I play the Throne Room, automatically Throne the other action." or "If I only have two actions in hand, a village and a smithy, automatically play the village."
So Sauna's autoplay should offer you the option of "never trash" or "always ask", but it shouldn't ever get into decisions based on what you'd actually be trashing.