What do you base your arguments off of?

I have a reasonably detailed chunk of mathematics that worked on how to make Elites that where not "punching bags of HP". It did result in their HP being reduced by about 30%, but their Defense stats also went up, and their damage output gets tweaked.

I haven't done an analysis of solo monsters.

...

The basic problem with punching bags of HP is twofold.

First, it punishes players who dare attack an elite/solo while any other monsters are alive.

Second, it can quickly reach a point of ridiculousness, where any party capable of killing the creature is in little danger from the creature's attacks.