Let me make it easy for you, lets say we need 225k damage to kill a boss. Gjally does 9k while other rockets do 6k. Everyone has 5 rockets, so a gjally user would do 45k damage, while a non gjally user will do 30k damage. Right now we need 3 gjally users and 3 different rockets to kill him. Now if we make ghorn do 40k per 5 shots, we'll need 4 gjally users and 2 regular rocket launchers and some extra shots from primary to kill it. Most people would go for the easy way where they don't need to shoot extra shots with primaries, that would mean people would require 5 gjallys to do what could've been done with 3 gjallys in the past.