Allow me to provide another article:
Magic A is Magic AIt's a basic precept of fiction writing. The audience is willing to suspend disbelief to a very generous degree, but once the writer establishes the rules of the story universe, in the interest of their audience's continued interest (and sanity), it's in their best interest to
follow the rules they made up.
"We don't ask that you stay within the bounds of physics, but at least follow the rules you freaking made up."
Putting aside the ethical considerations surrounding all three endings, Synthesis has no narrative foreshadowing, no logical mechanism for its implementation, and no basis in either real-life science or that which was established for the Mass Effect universe. It got pulled out of a hat at the last minute, and a good number of us aren't willing to simply accept it without question. To an extent, Destroy and Control do this as well, though they don't do as thorough a job of mangling the story universe as the oft-professed "utopia button" ending.