Where this idea came from (If my memory serves me correctly) was, in the beginning, they were tossing around ideas of what to put in the game and this was one of them. What brought it back into the forefront was the recent bug/glitch in the Star System where you were deposited on an ice lake with no respawn ship. I agree that the "suit equipped" refinery and assembler would have to be limited. Maybe tie it in with the carrying capacity or some kind of balancing. Also when you were able to upgrade to full sized, you could disassemble them into their basic components just like grinders, welders and etc. I see a scenario where you were a stowaway on a freighter and they booted you out of an airlock. Then you would have to wisely choose which priorities to accomplish first, be it energy, oxygen, or hydrogen. Another one would be where you crash landed and there was little to salvage from it. At the very least they could be used to repair the damaged ship refinery and assembler.