something strange about the "minimum 1 damage" rule for crushing/cutting knockback

[Plane]

B378 top-right under Knockback

cutting attack can cause knockback only if it fails to penetrate DR

1 cutting damage hits ST 3 target w/ 1+ DR (turtle?) : fails to penetrate, knocks it back 1 yard, just like a 1 crushing damage would

B378 mid-left under Damage Roll:

A negative modifier can’t reduce damage below 0 if the attack does crushing damage,
or below 1 if it does any other type of damage.

So imagine this situation as a ST 10 person with thrust 1d-2 and swing 1d

You have a credit card (MA224 swing-4 cutting: so you do 1d-4) and make a 1-handed Defensive Attack (-2 to damage). Your 1d-6 cutting attack will always do a minimum of 1 damage: you will always knock back that turtle exactly 1 yard.

If however you punched (thr-1 crushing: 1d-3) as a defensive attack (1d-5), you will only knock back the turtle 1 in 6 tries.

One-handed shoves aren't any better, they also do thr-1 so a defensive 1h shove would be 1d-5 as well: the only benefit is that 1/6 of the time you do roll a 6, the 1 yard knockback gets doubled to 2 yards. The other 5/6 of the time the turtle stays put.

Maybe to avoid this there could be some rule making cutting weapons a bit less effective at knockback, like "cutting attacks are -1 to basic damage for knockback calculation purposes" perhaps?

It becomes a bigger issue as a wider variety of weapons can inflict cutting damage, like Tip Slash for Impaling for example.

That gives a scenario where you're more likely (as a weak person) to be able to knock back the turtle using a flick of a rapier than with the poke of a bo staff, if you're down to that 1d-5 threshold.