The thing that just frustrates me about ADCs is that they're never irrelevant. Unlike every other role where if they go 0/10 they have to open mid, ADCs never have this issue. All ADCs have to do to get back into the game is to literally pick up 1-2 core damage items and suddenly they can out DPS the extremely fed assassin/duelist/bruiser who has been popping off the whole game and has 2-3 items up on them. Sure, that's exaggeration, but it's true.
Case and point, I annihilated my mid laner as Kat and I made Tristana go 1/9. As my luck would have it, just because we couldn't end in the next 7 minutes Tristana miraculously got her Shiv->IE+a Zeal off to the side and suddenly she got to be 12/9 in the next 5 minutes. Sure, her team certainly helped her, but the numbers she was dealing in terms of damage was absolutely obnoxious.
Want another example or a few just to be safe. Twitch, Xayah, Varus, Kog'maw, Vayne. All of those champions SHOULD be bloody late game hyper carries, but that couldn't be further from the truth since the moment they pick up their first 1-2 core damage items they just turn into these walking artilleries with either an excess of flank-ability or an excess amount of utility (CC) for the team.
Personally I just think that Precision is still far too broken on ADCs and the decision to make it primarily for ADCs was a stupid choice in terms of gameplay design. But they can't nerf it too hard otherwise it impacts the classes who actually have no other proper tree to function with, so bruisers. Like....why does the ADC class get this tree almost exclusively for them and yet every other class' tree is so "eh" compared to theirs (in terms of functionality at least, different story balance wise)?
It also doesn't help that Riot has made the game legitimately ONLY about bot lane, specifically catering to the AD carry. Seriously, we used to have to rely on other lanes to win, now you legit just forcefully win bot lane if they're not winning already and wow....you suddenly win the game. Literally the macro to win the fucking game in higher elos is you just spoonfeed your bot lane until your ADC auto carries you through objectives, teamfights and sieges.
How that is healthy to Riot we will never know.
But yeah, you can never fully lockout an ADC from turning the game around. It's pretty disgusting.
(Unless you match an ADC against an ADC)