Itβs not so much synthetic bodies as synthetic brains. Once we can move into thermodynamic neural systems or something similar in effect, -anything- can be a body. You could be a spaceship, or a power plant, or an anthropoid robot. I would imagine that one would need enough sensory diversity to keep from going mad,
But I would imagine that corporeal flexibility would be one of the major perks.
But I think you underlined the issue of timelines. Yes we can technically go to Mars in only a few years, but people living there permanently is going to be beyond my lifetime. Unless some people are willing to drastically sacrifice their health.