"Sorry, I'm having a little difficulty understanding what you mean by loud and "loudness war effect". I guess you mean that the skill sets have too much diversity, and there isn't a solid theme?"
Yes.
loudness war effect
https://en.wikipedia.org/wiki/Loudness_warLong story short - greed for load lead to a point where everything is so load that is distorted and low quality by design.
Something like : DOS2 is like more of everything in every aspect. Resulting in a great mishmash of nothingness. White noise.
Floor effects overload
Bleeding overload
Grenades overload
Archer is Area of Effect master overload
Basicaly any skill has Area of Effect overload
Combat is Russian roulette because of unpredictable chain reactions overload
Schools trees are no specific. They are just collection of AoE spells. Overload
From game-play perspective DOS 2 is a victim of loudness war.