Axs is not just a flush machine
The reason you should avoid 72s is not because the resulting flushes get cracked by bigger flushes. It is because flush potential is almost never enough to pay the bills. Axs needs to scratch and claw its way to +EV by winning hands every way possible. Having Kxs instead hurts you in many ways:
1. Not improving and losing to someone's high card ace.
2. Making a pair of kings and having an overcard ace appear on the board.
3. Making two pair and losing to aces up.
4. You have K5s and make trip fives. You lose to A5.
5. You can't make a wheel.
6. Yeah, losing to an ace-high flush, often with extra flush-suit cards on the board. Somewhat unusual but very expensive.
This list could go on for a while. #2 is by far the worst, but the point is that wherever you go with Kxs, you find aces ripping off your pots. It really adds up. You don't just lose the profits from these pots, you also lose the money you spent playing them, the value bets/raises you don't make because you don't trust your hand, and the winning hands you fold because you don't trust your hand.
The only good thing about Kx vs. Ax is that fewer people play kings. It matters somewhat less that your kicker is no good.
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