And that demonstrates my point exactly.
The scene was intended to indicate Shepard lives. But the entire tone of the ending, as well as Shepard's apparent condition in the scene, simply does not bring that across. To people like me, it's simply an indication of despair and futility.
And sadly, all to often pro-ending fans condescend to people who feel this. Accusing them of wanting a Disney ending, of "not getting it" of exaggerating things. When really, the developers are the ones who didn't get it. They were so hellbent on a "bittersweet" outcome they simply didn't care what the players thought.
I think some of these pro-ending fans forget that the scene must work not only at an intellectual level, (yes we can understand that it is invitation to “feel free to headcanon your ending were Shepard lives, if you want”), but must also work at an emotional level, and that the requirements for each intellectual and emotional levels to work are different. Without the later, what we get is an incomplete game, one that offers no closure.
Just because it worked for these players at an emotional level, it was not because “they got it” at an intellectual level, but because they likely are of the “glass is half-full” kind of people in the first place, (and that is great), and also perhaps because they likely had less issues with the catalyst dialogue to affect their emotional predisposition.
Imo, the breath scene fails because it offers too little emotionaly, and it offers too little because the main goal of the scene was not to convey the idea that Shepard survives. Rather, the main goal was precisely to make sure that the scene, while opening the possibility of survival, doesn’t significantly diminishes the possibility of Shepard’s death, opening only the most faint of possibilities of a timely rescue. Otherwise, why cloud the only option at survival in (unnecessary) layers of ambiguity and unresolved problems that stand in the way of survival, when in the other endings Shepard’s death is either excruciatingly explicit or very clearly implied?
Note: edited for clarity