You said it: the most difficult ending to get in terms of EMS is still the breath-scene variation of Destroy.
And I wouldn't say that being concerned about the Reapers and revived husks isn't a "downside".
What'd you want ... people shooting themselves in the head because of it or something? There are going to be darker underbellies to every one of 'em, but the last thing people were asking for in the ending discussion was for things to be "darker".
I did say it. I also said it's pretty much an easter egg that took on a life of its own once discovered. As evidenced by how they didn't do a thing to expand on the breath scene while many other aspects of the endings (Synthesis in particular) were expanded on.
No concern about the Reapers or revived husks was given in the Synthesis endings, original or EC. In fact, EC explicitly shows the Reapers are all friendly, nevermind the billions of people they've killed
Given the forcible nature of the ending, mass suicides would be an entirely realistic aspect of the ending. It has very dark, unpleasant connotations. And I realize that peple didn't want the endings to be this dark.
But the problem was these connotations were simply ignored. They didn't even merit a handwave. They were simply ignored, whitewashed with saccharine speeches that make some people seriously wonder if Synthesis involved some sort of mind control. All the endings did this, but Synthesis was especially egregious.