Sure. But this is kind of vacuously true for any real world DoS scenario. It's like saying "sure, your new weapons system might wipe out 999 out of every 1000 of the enemy's forces, but what does it matter, they can just scale up by a factor 1000 and we're back where we started".

Anything that amplifies the cost and effort required by the adversary by several orders of magnitude is worthwhile discussing.

But more expensive (to get). At the same time, the PoW would require more compute power do the same device will still be capped at the same rps