Obviously it's better in a vacuum, but against someone who has an exploitable F24b, we went to form our range wisely. Against someone we're never bluffing, sure make the play that's best in a vacuum, but against someone that we're tempted to 4ball with Axo with, we wanna be extra certain to make any and every 0+ eV flat . . . well, except for the ultra premiums.

That fact that he folds to 4bs a lot implies that we have FE against him, not just preflop, and a hand like A5s is a great hand to flat with the intention of running some bluffs, whereas we're in a 4b or fold spot with much of the rest of our range.