Or it may show that the encounter is under-tuned or it shows that you can tackle the encounter through various means; some people face tank it, others exploit terrain + teleports, some people just snipe Alexander right off the bat, others use fighting retreats, others stun lock all the mobs and play the long game.
Also, in these games, 'slapping a bunch of arbitrary rules' is the norm; every single ability is virtually an exception to the rules. Basically, it's a test of 'how flexible is your party' in almost all of these games.
It should be pretty damn apparent to anyone who is playing that there is always a good chance of getting one shotted; you can one shot the enemies and enemies have the same abilities you do at times, plus, just playing in general if you play recklessly you can easily see, long before the final encounter, that you can die in one hit.
