We can pursue high energy intensive activities with renewables, higher than if we use fusion.
On Earth, solar allows high energy use before we run into limits from direct thermal pollution, since it uses energy already hitting the planet rather than introducing new energy.
In space, the energy available from sunlight vastly exceeds any available from fusion, and the feasibility difference tilts even more toward solar.
For mobility in space, beamed power will be best, and solar works with that just fine, even out to interstellar distances.
