I generally agree with your assessment that there are other moving mechanical assemblies that are likely to fail at some point as well so the practicality of re

I generally agree with your assessment that there are other moving mechanical assemblies that are likely to fail at some point as well so the practicality of re-fueling may not be optimal. But I also just wanted to point out as people discuss re-fueling that some of the concepts for this are not just open up the fuel tank and add more fuel but it might be operationally simpler to make a satellite that attaches like a jetpack [0] [0] https://en.wikipedia.org/wiki/Mission_Extension_Vehicle https://en.wikipedia.org/wiki/Mission_Extension_Vehicle