The burst damage ADC's can do to squishies is greater and more instant than assassins

Why don't you tone it down, riot

They should be sustained damage dealers not burst sustained damage dealers.

I'm more worried about getting into a 1VS1 against many ADC"s than I do against many assassins, especially those like Evelyn. Do you know why? Because assassins actually have burst damage that is delayed and can be countered.