I'm sorry, but your reply doesn't make much sense.
If PC death was systemic it would be impossible for you to not see it.
If lack of PC death was systemic it would be impossible for you to see it.
Neither are true and neither compare to the claim that the power gap MUST exist.
I'm NOT saying people don't see it. I'm sayignt he claims that it MUST be seen by all who play are closed minded and flatly absurd.
The bolded section was true for me - it was impossible for me to see PC death. It never happened and was never going to happen. It was part of the system we made for ourselves.
I'm not saying that everyone must see the power gap; I'm saying that it's simply an artifact of the system, and one must take steps to change the system in order to get rid of it. That's how it's similar to PC death for me in AD&D - it's part of the system, but we changed the system to get rid of it.
I could be wrong. The power gap is true in my experiences, but I'm aware that my experiences aren't that broad. If you have some examples of your play that show how it's not the case, I'll accept it.
[sblock=My current 3.5 game]I'm playing in a 3.5 game right now, and my main foe - though luckily he doesn't care much about me - is an ancient green dragon vampire (CR 20+). I'm 12th level*, a fighter-2/wizard-4/spellsword-1/abjurant champion-5. I am plotting against the vampire - and the young adult red dragon that he sent us against, whom my githyanki companion thinks will serve us willingly - and I have no idea how I'd do that if I wasn't a 10th-level wizard caster. If I were a fighter, rogue, ranger, barbarian, monk - I'd have no way to deal with him.
* - I wouldn't be if we didn't have access to Plane Shift - I used Lesser Planar Binding to call a Janni as my vizier, and the other PC is a githyanki psychic warrior. That saved me from five! DC ~23 negative levels as we Plane Shifted to Sigil where I could get access to a Restoration spell. My Overland Flight couldn't reach to the nearest city before I'd have to start making Fortitude saves.
Cool story, though - since we had two Plane Shifts, I wanted to get back into the dungeon before the NPCs there took the loot and ran off. We Plane Shifted back to Faerun and I attempted to Teleport back to our previous location - a necromantic circle of great power - and messed it up. Now we're in a "Similar Area: You wind up in an area that’s visually or thematically similar to the target area." Pretty awesome![/sblock]