Most of us are coming from the same EU server, where macro wasn't working and still the server was full of gladiators. Gladi party setup is maybe the easiest and the strongest end game combo for Mass PvP. One mage party even tho without macro skill re-use was trashing all types of party setups. With macro or without mage party is strong in h5 if played well.
About benifts from macro, ye mages will spam aura flash without cd, and gladi aoe nonstop and soulhounds will spam soul of pain, but u see here mp restores 1200 mana per 12 secs, which is rly low in PvP. You will run out of mana easily in PvP only from skills spamming and plus that healers can control easily top DDs MP with mana burn and mana storm and ur argument is invalid that mage, gladis and slhs will be OP, because u can easily control them and they are highly MP dependend.
Every single class will benefit from macro one way or another. I can give u many examples.
The way MP pots are working here and the amount they restore will allow us use the macro re-use without any problem and imo they will improve ur character's gameplay.
+1 for working Macro :)