I didn't mean to suggest that A256 was worse than A128 (though I see how it would read that way). I was just trying to point out that things are more complicated than comparing two numbers.

That being said, I don't know if I'd agree with anyone suggesting that A256 provides a meaningful increase in practical security over A128. As you said, the main difference is post-quantum and you can't just drop A256 in and say you are ready for post-quantum as you need a more holistic post-quantum solution anyway.