i'll try to be more explanatory :
You say the red line black line, but for a Short Canon (Like R35) 30-50 hit% at 300meter and A long canon (like L/50 (P IV H)) 80-100 hit% at 300 meter it's absolutly not the same %hit. I'm not an expert in balistic and ToW is a game. And another thing i think the peapole on terrain don't have the penetration of all face of ennemi tank ar any distance and for any ammunition. So have a range or an aproximation of %hit will be a good idea.
Cordialement, ExA.
NB : They could put it in option like this all peapole are happy.
Sorry for my very bad english.