This stuff is everywhere.
I've made this list before, of the most hinted endings. Keep in mind that this is after all DLC is out. There's another list I'd make that would account for only the base game (teaser - it wouldn't have Breath Destroy as #1).
1. Breath Destroy
2. High Destroy
3. Low Destroy
4. Vaporize Destroy
5. High Control (not counting Para/Rene differences)
6. Low Control
7. Synthesis
(not counting EC Refuse here)
By the way, this doesn't mean that there isn't, say, *any* messaging about Synthesis. It's there. But it's much more optional, and much more niche. It includes things like Genophage Full Cure, Thane Romance, Rannoch Peace, either minimal or many deaths happening, etc. (though it does accomidate both Paragon and Renegade Shepards to a degree)
But yeah, after all missions and conversations and DLC are said and done (and I'm mostly counting a ME1-ME2 import with everyone alive and Loyal btw), Breath Destroy is typically the most hinted. It doesn't block off the other endings though, and one is allowed to, say, imagine that ReaperShep makes an avatar to visit everyone or whatever. That'd be headcanon, but an allowed one.
Personally, this is how I RP now. I have Shepards that I'm planning to detail how I'll 'script' them, and how they'll reach their Control or Synthesis or Destroy or (maybe) Refuse endings. Because the writing is all there, often in ways that aren't consciously noticed by the player.