I know Mercury is a smaller sand box...
Let guardians use their sparrows outside of the Infinite Forest! The Cabal use Interceptors. The map is about the same size as one of the two main areas of Titan. We can use sparrows on Titan! Please unlock sparrows for Mercury. At least unlock it after the completion of the Curse of Osiris storyline.
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We can on Titan. So why the heck not?