It's interaction is kinda complicated. It will effect the percent added from wsc of each the same... but since those are added together with other things to add to base dmg the percent gain on ws will differ based on a few things. Mostly how big the stat mod was to begin... bigger meaning this will have a greater effect than lower stat mod and weapon base dmg with the lower weapon base dmg would mean the alpha change would have a bigger effect than on higher base dmg weapons.
So indirectly this is change will overall boost 1hd ws more than 2 hand and ranged and will boost merit ws more than others but most the non merit ones are getting stat mod increases too. And magical it will depend on the specific formula
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