I think the reality was no matter whether Shepard survived ME3 or not, Bioware simply DIDN'T want the character to be the protagonist in the next game. The company also practically said as much before the Extended Cut DLC was even released.
As for the
Synthesis ending, I suspect the position there was if you wanted to save the Geth (now a species actually capable of free will and not just a gestalt consciousness), you also had to save the Reapers as they are merely puppets; programmed to protect the cultural history of other races, not continuity of the race tiself. It's not their fault they do what they do, but instead the result of arrogance by their predecessors to try and play god in the universe.
By the standards of many real-life philosophies as well, the ultimate evolution of organic and sythetic life is to hybridise them if "transcedence" (becoming pure energy) is not a viable option. Otherwise extinction is the only alternative...
That's not to say I'm defending the death of Shepard in that choice - I think if you were high enough a Paragon or Renegade and had a high EMS, there should've been a way to save their life even if they didn't be the protagonist for ME4.
Modifié par Tiletron, 09 août 2013 - 10:32 .