Id say take a closer look again at those trailers. Sure there are similarities with not only Braytech, Io, or most Vex conquered planets. But thats by the design and architecture related to certain factions or enemies found withing the location. Like what are you really expecting, have vex suddenly have bouncy houses for lost sectors? Same thing with the Braytech construction found withing the trailer. Its to show that human kind or a warmind once set up a base there. What im trying to get at is when you see a specific type of archetecture that youve seen for a while now, your brain automatically recognises who made that place, its possible purpose, and probably what to expect. I wouldnt call it recycled. I mean just take a look at how many times New York has been remade in so many games. Same basic idea with Manhatten being its main playable area but nobody calls each incarnation of New York a carbon copy of each other, let alone recylced content