So close yet so far.
The guy misses the mark by just a bit. The truth is, the entirety of Mass Effect after Shepards got hit by a Prothean mind beam back on Eden Prime has been a dream... or rather, a fantasy. He nearly died, and since humans couldn't take that sort of stress on comprehending a direct alien imprint on their nervous system it scrambled his brain and left him delusional and paraplegic. Losing all your SAN points, one might say. The Sovereign he saw on the planet
was a geth warship. Saren
did betray the Council. But the role of Commander Shepard, Systems Alliance, ended that fateful day on Eden Prime when his mind was fried by the Prothean beacon.
All the players had seen and played through were events in a medical center that had been filtered through the character's addled brain, aided by the lingering effects of the Prothean beacon. Imagining hospital staff as the members of his party. Getting transfered to another medical center (The Cerberus Center for Rehabilitation of Orphans) for surgery to try to repair both his mind and body (didn't work, but he had a near death experience). Imagining 'Collectors' when in truth they were just a projected metaphor for his caged mind (all those frozen colonists mean
something) which is unable to collect its thoughts.
By the time the third game rolls around, his subconscious has begun slowly knitting itself together and emerging as the form of the child (its a white boy even if you are playing EXTREME Shepard/Femshep because fucking Jung or something). The Reapers are constructs of his mind that are controlled by his subconscious and given power by the Prothean beacon's effect on his mind. They are there to keep him fried (or indoctrinated, which is a big, big hint in the games that all is not what it seems) because deep down he doesn't want to regain clarity, he's afraid.
Therefore the 'Destroy' ending is the best ending because he overcomes those mental blocks and begins his way to recovery (he survives). If he becomes an AI he will succumb and not even be able to perceive the fantasy world he has set up - he'd go comatose, his mind truly no more - this is the worst ending. Synthesizing allows him to continue living in his fantasy world as a literal god as he recognizes his own power over his fictional creation, symbolized by jumping into the beam and becoming part of everything in a wave of energy; combining events of the real world and his own desires, adding his filter of bias, and synthesizing the story that we see in Mass Effect - that is the meaning of synthesis.
The DLC will only be tagged onto the Destroy ending and it will depict Shepard not being a drooling retard anymore and you have QTEs to help him with his physical rehabilitation.
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