That's mainly a hypergolic fuel thing. The goal with Starship is to try to use Methalox everywhere so that's the only thing that needs to be resupplied. Long t

That's mainly a hypergolic fuel thing. The goal with Starship is to try to use Methalox everywhere so that's the only thing that needs to be resupplied. Long term this would be meaningful for ISRU, but short term this would be meaningful for in-space refueling and propellant depots. A more typical approach of using different fuel types for different things would create all sorts of restrictions on capabilities and would make in-space refueling more complicated.