No, I do understand all of this. My problem is that one and the same enemy with identical damage rolls can hit my naked mage and my heavy armored dwarf and it makes no difference, it's 10DMG either way.
That's what I was saying above I do understand the system I just don't think it's a good one.
On a single attack you're right.
But on an entire combat (or multiple combats) your wizard will most likely take way more damage than your fighter.