You definitely don't have to have W.Stance up, you're just missing out on 50% possible extra damage given you take the measures to fulfill Weak Stance (and 30% if you'd have taken A.Stance without any requirement). Whether that's a big deal or not to you is your choice to decide but mathematically it's pretty significant.
It's no secret that A.Stance is a boring skill. I mean it's called Average Stance, what can we really expect.
My postulation is simply that the Katana PAs that see the most use (and most certainly will after the buff) will not benefit from Weak Stance in combat situations as often as it will Average Stance.
If you or anyone really wants to argue that Hien Tsubaki or Asigiri are great PAs for hitting weak spots then this conversation may as well be about Teddy Bears. When you're using the Katana you want the freedom to attack from whatever angle you please. Adding a conditional requisite to your damage (that corresponds with a huge chunk of your damage mind you) that entails you can only do damage on exposed weak spots just makes you weak overall in my opinion.
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