Okay, its as I suspected. I had a feeling it was this, but its been a while so I wasnt sure if this changed or not. Thank you for confirming. Now getting to the issues with this hax scaling, this was actually brought up before, but it was a long while ago and I have no idea in which thread this was in, so i'll be bringing it up again here.
The problem im having with using Gonzui as the basis for the current soul potency scaling in Bleach is that Gonzui and the other generic soul haxes in the verse are not 1 to 1 to each other. In other words, they don't
correlate with each other to suggest that they scale from one another in the first place. Insread, we are using
cross-scaling between
different forms of soul manipulation to give a value for the hax's potency, a type of scaling that we aren't allowed to use for hax abilities as they don't make sense. The biggest offender of this problem in the verse is Reiatsu Crush for example.
Now as you said, the logic behind Reiatsu Crushes current potency is that Yammy was easily soul crushing Tatsuki's soul just being near her, the same Tatsuki who resisted Yammy's Gonzui, a technique that absorbed souls from hundreds of people across Karakura Town. But herein lies the problem.
Reiatsu Crush isn't the same type of soul manipulation as Gonzui.
Reiatsu Crushing an opponent's soul is
destroying their soul. Yammy's Gonzui on the other hand is an ability that
absorbs the soul. These 2 particular soul haxes are
2 different types of soul manipulation that are
applied differently and
effect the soul differently. They don't corelate as they are not the same kind of soul manipulation as one another, so the potency behind their soul hax differs from each other. Absorbing a soul is not the same thing as destroying it. And in this case, Tatsuki did not resist having her soul destroyed by Yammy, she only resisted having it pulled out from her. Aka, she resisted her soul being absorbed, not destroyed.
Because of that, we have no real basis to scale Reiatsu Crush from Gonzui since both do not do the same things as each other. Reiatsu Crush cant absorb souls and Gonzui cannot destroy them. So what concrete reason lies here for us to scale Reiatsu Crush from Gonzui? From what I see, there is none. Instead, whats being done is incorrectly cross-scaling the 2 differently applied abilities from each other so that the potency of Reiatsu Crush is defined. And as said above, cross-scaling between different forms of hax isn't allowed since there's no basis behind the scaling.
Ofc, Reiatsu Crush isnt the only example, but you should see the point im trying to raise here. The potency of Bleach's soul hax is coming from arbitrary cross-scaling between differently applied abilities, and thats an issue that needs to be raised.