Reusable rockets is new. Rather than ditching in the sea, the rocket landed back on earth and could in theory take up another payload a few days later, which i

Reusable rockets is new. Rather than ditching in the sea, the rocket landed back on earth and could in theory take up another payload a few days later, which is much cheaper and more efficient. It opens up space to a lot of other uses. Compared to the cost and use of the shuttle (nominally reusable but not so much in practice), or other disposable rockets, this is a large step forward in reliability and efficiency, which will enable things like travel to Mars at low cost (by refuelling in orbit with multiple reusable vehicle launches for one mission).