The worst thing about ADCs is how they are never irrelevant, and demand attention no matter what.
Even when the enemy team has a fed-to-shit Bruiser/Tank/Assassin/Mage, someone still has to focus the relatively un-fed ADC in addition, because they scale so damn well they are never irrelevant.
Ziggs is 13/2/8 AoE-wrecking your team? Welp, still have to focus 7/8/2 Tristana or force her out before she murders everyone.
Talon is 10/0/7 wiping your carry? Sorry, one person peel him, we gotta dive 5/5/3 Ezreal.
Fiora is 8/4/10 melting the backline? Kite harder, we have to burst 3/1/2 Lucian or we lose.
Mundo is 5/1/12 all up in everybody's face? Tough luck, 9/13/4 Caityn has to die or we all do.
can all go both supp and adc. Sometimes when with premades we go pick 2 adc and 2
, usually goes pretty welll.

even though you are lagging behind you still murder everyhting by critting them down if left unchecked
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. Otherwise, those that are decently well-balanced stat-wise should have more relevancy throughout the game than those that just win by being hard to catch. I want to be able to play
without the chance of being completely pub stomped by the aforementioned mobile carries. Some of these immobile marksman are usually counterpicks to the mobile ones, but with the sheer power curve they have, it's hard to play against them. Also the itemization is way too in favor of them. All the items that are usually meant to them are extremely overloaded with stats, as well as tank items being WAY too efficient on them. I remember back in the day that your options for defense were things like Banshee's so you didn't get blown up by the enemy LeBlanc or Ahri. Now all the items you build give the stats that you would normally build on a marksman without having to sacrifice damage to save your life and remain relevant in a fight. Biggest problems here are Sterak's, Maw, and Mercurial. Sterak's was meant to be an item for your AD tanks/bruisers so you could have the survivability needed by the role, as well as have a little extra base damage. Maw was another counter-mage AD item so you could be lucky to make it out of a fight alive, but it usually was in your build anyway before all these double lifesteal and double attack speed builds come into meta. And Mercurial DID NOT need the extra lifesteal added onto it as well as having the Cleanse from QSS. It needs a serious nerf or remove the damn lifesteal.