What would they use it for? If you're going to Mars, your vessel has a reasonable crew habitat, so you don't need Tiangong I for that. Tiangong I is more payl

What would they use it for? If you're going to Mars, your vessel has a reasonable crew habitat, so you don't need Tiangong I for that. Tiangong I is more payload than spaceship. Its tanks can only hold about 1000kg of propellant. Mr. Musk's proposed transfer stage has a propellant budget that's nearly 2,000,000kg. Having to maintain compatibility with it may be hard (comms, docking, etc). There might be some hardware you could loot off it, but it's not worth flying a mission just for that, and launch windows mean visiting on a trip somewhere else would be prohibitively expensive.