Well, that's demonstrably wrong. In Chainmail, one hit was death. In OD&D, you got 1d6 hit points per level and damage was 1d6 for each weapon, the inference being each hit was actually physical damage. AD&D broke with this and inflated HP progression and then came up with the idea that HP were both, but BECMI indicated that HP were damage. 2E specifically calls it as damage only, and 3E shifted back into the nebulous area that AD&D occupied, and 4E sort of did the same, but tried to take down the physical side of HP at bloodied/half max HP. So, you're actually incorrect in the "never" point of that statement.
I don't see how this is 'demonstrably wrong', with the possible exception of Chainmail.
Though the numbers vary in editions, in each edition (save 4th were you got more starting hp and fixed increase every level) you can potentially double your body's ability to take weapon hits by going from 1st to 2nd level, followed by a rather linear progression to 'name level' where it levelled off a bit. There was never any penalty to being 'wounded' other than being that much closer to that arrow, sword strike, or spell with your name on it. I could perhaps buy the "fighting through the pain" argument if hit points didn't increase so dramatically over levels and the fact that there is no debilitating effects whatsoever as long as one Hit Point remains. So in practice, despite whatever verbiage any particular edition dressed up the concept of Hit Points in, the end result was the same: a poor model of physical wounds, yet a convenient and rather simple to use abstraction.
As for the exertion with regards to spell casting, you are of course correct, I was merely pointing out that nothing from a simulationist/realism perspective prevented such a mechanical system from being implemented (such as spell points, mana, etc.) But that was more of a theoretical musing, and I would hesitate before advocating such a departure from tradition for D&D Next.
And I didn't use the word "realism" now did, I? And I agree with your parenthetical.
No, you did not, and I apologise if I misinterpreted or misread your position, but given the title of the thread and that fact that your arguments seemed to be coming from the Hit Points = Physical wounds faction, I assumed that realism (to a degree) was the crux of your position about Hit Points.