I'm aware of this. I'm arguing that we should train, and brief, that the PF should always do the abort.
But you said the PNF can see problems happening faster, so your argument leads to the conclusion that the PNF should always do the abort.
But what you're really saying is that it's arbitrary that the captain will always do the abort no matter whether they're flying or not. It's that or you don't realize you're making two arguments at once.
That's not factually driven, that's arbitrary. We either trust first officers to not crash the airplane or we don't, but if we don't they shouldn't be doing take offs or landings. If we trust first officers, we should train them to fly the plane from the start of the take off roll to the roll out. Or, if you're saying the facts back it up, we should have the PNF always do the abort.
But if we're going to say captains should always do the abort because they're captains, just say it.