As I see it, the there is no good reason for the geth to want to give Rannoch back to the quarians. It's a planet that they conquered in a war that (as far as they're concerned) has been over for some three hundred years.
Why would they give it to the quarians? What could the quarians possibly offer that would motivate the geth to both allow a long-standing enemy to set up camp in the heart of their territory and make the extensive military, territorial, and economic concessions that would be required to make any exchange of Rannoch actually workable.
As others have said, the geth likely
haven't given up Rannoch because they don't trust the quarians (and vice versa) and there has never been an opportunity to do any negotiating.
If you're asking why the geth
shouldn't give up Rannoch, then the answer is a bit different: giving the quarians Rannoch is a tremendously expensive prospect where the only real losers are the geth.
Modifié par General User, 17 octobre 2011 - 04:04 .