I know what unique passives do, but I just want to know why there's such thing as unique passive.
For example, what is wrong with stacking 
to get multiple effects? I am paying same amount of money each time to get it.
I am just curious.
Because, a long long time, 6 sunfires was a thing.
Imagine getting 6 gunblade.
ADC with 5 IE would crit for like 3k dmg because they crit for like 400% with 400 AD. Stacking effects would be bad. Or Phantom Danced. Stacking PD would give like 70% damage reduction.
There was a time where Tiamat Twitch was a thing. You could instantly wipe a whole team if they were close enough.
Because 6 lichbanes don't need to exist on a champion. Or 6 triforces on fiora. I'm down for balance. I'm down for unique design. Im not down for 2k damage on a 2 second cd.
