I don't know why.
But the boards are so biased. Once you make a thread about a MAGE or a TANK beeing overloaded everyone goes full on defence mode and start babyrage at you. When someone makes a post about an Assasin or a Bruiser killing an adc in seconds everyone loses their minds and starts spouting venon for the said champ.( and yeah adc should instantly die to assasins if you consider that mid/late game adc can just 3-4 hit anyone that doesnt have at least one big armor item.) I don't know about you guys but i'd prefer beeing oneshoted or maybe somehow manage to outplay another assasin by dodgin one or two of his spells even if a spell does 60% of my health rather having to deal with a retarded tank that does half my health with one rotation and is simply unkillable and unkitable.