Unsurprisingly, I concur with both you and @Apollonius. Unfortunately, ME3 was the designated end to the series. The designers sought finality, and produced it, however unsatisfying it might have been.
I guess my point is that a "final reveal" is exactly that. Revealing the definition of something -- or even setting one -- is useful to show people where you are going with a story, but inappropriate, pointless, and misleading if you want people to determine where the story goes.
If I could have written the MR trilogy's ending, it would have been easier to decide: (1) suicide; or (2) obliterating the Citadel's control mechanism. If you pick the former, everyone dies; if you pick the latter, the Reapers power down and just sit there like ominous reminders that some fucked up idiot (Cerberus or otherwise) may find a way to reactivate them again.
Or, maybe, like the Geth, they just wake up some day.
Or, maybe, the Leviathans decide, fuck it, let's eliminate everyone.
To me, the best part about sex is engaging in it. When it's all over, I may be happy and satisfied, but I'm just going to want it again.