Year 2019. Kassadin is still cancer.

Yeah... a 1 second flash that eats through his entire mana pool, requires him to reach lvl 16 to get that low and requires that the enemy doesn't blow him up before he reaches that point. Seems to me that you have no idea what a late game hyperscaling champion is

it only takes him the entire game to get to that point though.

###>Being the squishiest champion in game in terms of armour.

ADC's, AD assassins and AD fighters literally eat Kassadin for breakfast.

Not to mention it takes him up until level 16 to really get going. Most games are closing out by then.