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but it's also because the technology of the ship and the suits look like refinements on the originals. In ALIEN, the ship looked cruder and the suits were way bulkier and more awkward. In this iteration, the ship interiors look more streamlined and the hibernation pods look much higher tech. The suits they are wearing have a lot of elements of the originals, but are much more streamlined and maneuverable. That seems to indicate an evolution of the technology from the time of the NOSTROMO;
One thing you have to remember about the Nostromo is that is was essentially an interstellar 18-wheeler. By that logic, it should look crude, grimy, old, beat up etc. Right now, you can buy cars that are all sorts of sleek and have all sorts of neat displays and do-dads and what not. There are cars out that that can apparently parallel park themselves. Tractor Trailers don't seem to have changed much over the years. They're certainly not or ever have been sleek and I would imagine they don't have elegant displays, leather interior, faux wood paneling and the like. What we're seeing in Prometheus could be some kind of state of the art scientific research vessel.
Also, and not that it is a great example, but a lot of the technology in the Star Wars OT seems to have "devolved" from the PT.