Scenario 1: You are Ganon at 98%, with three stocks left. Your opponent is, say, Marth, fresh off the respawn platform at 0%.
You're about to die anyway, so what's better than taking another stock off Marth? Bait to edge, Flame Choke, kill you both.
Scenario 2: You are Ganon at 98%, with one stock left. Your opponent is Link, at 50% and two. There's no winning this, so go down in
style. Even though he won, make him feel dumb by Flame Choking him.
Dorf is the special case. Accept it.
That's implying that pullbacks aren't a thing, and that non-projectile players can't just bait you into the center of the stage like you have to bait them, or just straight up take you down faster than you can pull off the tech. I've had Ganons more than enough times try to bait me for suicide chokes (
While I'm Marth (I occasionally play Marth, albeit badly.), and at an advantage, no less.) and fail to an extent where they just lose the lead, it's just not a viable technique against a smart player, even against characters with no projectile. Chances are they'll space you out pretty nastily because you're attempting the same thing over and over. That's just it - it's an okay game ender, a surprise mix-up at best, but it's not exactly game-winning. The way you describe it makes it sound like it's a reliable, strong tactic, and it's just not.
-and seriously, I doubt many people feel dumb for walking into a move that wins
them the game. It's no less stupid than interrupting PK Thunders by jumping into them on the rare occasion Ness needs it to recover. It's
your loss, even if they go down, too. What's to feel stupid about?
Flame Choke is good as a move, but suiciding with it is far, far from what makes it a good move, and it definately doesn't dictate what makes Ganon good as a whole.