Are ADCs useless ?

This season and previous (since assasin update i think) , the adc is useless. ADCs don't do enough damage if they are not fed or behind ,assassins easily kill them, even a decent bruiser champ can kill adc fast. Also around internet i've seen videos and blogs about how adc is not worth playing. A lot of players now take zigs , mordekaiser or bruisers instead of adc and it works well. So i wanted to know what are your thoughts on this one ?
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