I kinda get what ra target size do. But im wrapping my head why merge has relation to it. My theory is reconcile with my observation of faster cons move speed. Bigger target size covers more area. Etc.
The above about faust shows the old misconception won't die. Its on Wehr so it must be the best!
We already talk previously and conclude faust is not best or adequate for wehr. Pen values matter little cos health make snares. Homing faust dont matter cos it need los, moving into sight blocker and u wasted muni. Animations matter cos a drop model will reload the whole animations.
Higher RA with merge means that if you merge into elite infantry (which has lower RA) the models that transfer over are easier to kill than the original models.
Pen values matter because the Allied ones can bounce off of generally heavier Axis armor, all health damage incurred is the same. ALL snares need LoS to throw, the faust is not unique. If the faust hits the ground, it's a rare bug that cannot be fixed without repercussions; otherwise Faust LoS is the same as any other snare. Animations cannot be sped up, so there is nothing we can even do about that.
It's not "because it's on Wehr, it must be the best," its that the stats objectively are the best. The only downsides it has are related to a) an unfixable bug and b) an animation restriction that can't be sped up, same as Molotov.
I think your "adequate snare" for Wehr must be a 35-range 160 damage faust that can be targeted regardless of LoS and also confer the immobilized crit.