Its a tradeoff between complexity and results. Think of it like this, every kg added to Starship is one kg less to Orbit. And maybe like 10-30kg less to Mars.

Its a tradeoff between complexity and results. Think of it like this, every kg added to Starship is one kg less to Orbit. And maybe like 10-30kg less to Mars. For what you are talking about you likely need 16-32 SuperDracos, you need massive tank. A highly complex system of tubes along the vehicle and so on. You would reduce the payload to Orbit and return by a huge margin. On earth, for a system to be reusable AT ALL, is incredibly hard. Like seriously, super hard. Their margins are already very thin. I'm not even sure what you suggest is possible at all. And such a system would only prevent some very few cases. You already have engine redundancy. It wouldn't save you in many failure cases either. So its a gigantic increase in complexity for a slight reduction in potential failure. The extra complexity quite apart from the performance would also lead to many new failure most that must be considered. If in a full risk analysis this would actually be safer is questionable. If you want to increase safety adding a 4th Raptor would like by safer, as well as starting the flip earlier. P.S: The fuel would also be highly toxic and would make operations with humans much more complex and much more expensive.