I mean, this shouldn't be too hard to prove.
1. Get a save towards the end of the game.
2. Respec between various two-handed / ranger / mage builds, preferably naked except for the weapon
3. Record damage ranges for all abilities
4. Look up boss stats for key fights in the editor and compensate for resistance values
5. Look up physical / magical armor ratio for bosses as well
Does everything line up?
That's more of a scaling issue than anything and not necessarily applicable. Primary problem with that is gear scaling in general after level 17 or so is just crazy, and physical class' skills scale in damage with their weapons, while spell damage has no similar scaling.
Resistances are a problem, but the biggest issue between phyiscal and elemental is the lack of comparable scaling. There is none. In the earlier portions of the game resistances are the biggest problem, and in the later portions, gear inflation is.
Also, regarding Time Warp: Fane on Fane always, especially if you're using Glass Cannon. An extra, uninterrupted turn for 2AP? There's no real decision here. If a solitary elite/boss is stunned, that's a different story, but also a lot less likely in the first place.
