You must be dumb then, because to even damage morgeth you have to do every mechanic that encounter has to offer. You must gather 10 taken strengths, and properly cleanse 2 people, as well as kill all yellow bars to get the final orb to spawn and usually provide defense from his axion darts. There is nothing cheesy about morgeth, it’s just a lack of a health pool for the boss.
Edit: I will say that you don’t actually have to cleanse either. Which is a cheese in a way, a bad one, but a cheese. You can simply allow the “tornadoes individuals” to die and let them Recover their strengths since that is the only required mechanic. But attempting this gives you less time in the damage phase and increases your chances of wiping