Here's an interesting point. After dealing damage to the Titan with magic from the Fairy Dragon, the Djinns mostly just heal and cast spells. They sense that otherwise, he won't survive.
It's more difficult in LotR on day 5 to kill the Fairy Dragon with 2 Angels, but there seems to be water resistance, so it's also a solvable problem.
That's why you need to take 2 Angels, not an Archangel. If the author hadn't planned it this way, there would be a problem with scaling. Especially since he gives you a choice of what to exchange the Vampires for.
And so on.
P.S. I remembered an interesting battle from the map "Nine Riddles"; how is an ordinary person supposed to solve this riddle? Screenshot.