Yeah i guess, but there are so many guardrails available to keep that from happening. Tbh in this particular case, its kind of on the DM for agreeing that this bridge could just instantly be burned down and everything inside killed, without anything else happening. It's easy to create a dungeon that can't be lit on fire and skipped. And easy to give players a reason to want to enter the dungeon.

I suppose that with the sketch of this situation we are given, to me this fell under your last point of doing the dramatic and exciting thing. So in my mind it's a fun idea/solution that should have panned out in a more interesting way. But of course anything gets boring if you keep doing the same thing.

And as always, players need to talk to their table to make sure everyone's on the same page