Except it IS a scaling mechanic, whether you like it or not.
Dynamic Damage Reduction, the original system, reduced player damage dynamically based on their dps output. Scaling the damage the player dealt to make the boss more durable. This didn’t work against burst damage and could easily be circumvented, and just generally felt bad for the vast majority of players. So they replaced it.
The current system of Boss Ward has phases where the longer the ward lasts the faster it decays… Almost as if… gasp it scales to your dps!! How shocking!
You can insult my intelligence all you want, but the fact that you can’t even understand the design intent of the mechanic you’re complaining about when the developers themselves have told us what it’s meant to do says more about you than me.