Impossible to climb in solo que as ADC
Every game is a coin flip for ADC mains unless you are skilled around an entire Tier above your current rank. The fact that we heavily rely on supports and junglers basically means it is impossible to climb alone. You must duo with a decent support in order to climb. I personally don't have support main friends around high plat to low diamond elo, so I am basically screwed. Sometimes I duo my friend using my gold 2 smurf account, and I can tell you it is pure torture to play in lower elo as an ad main. I just have to rack up a few kills and 250+ cs at 30 minutes in order to carry, when supports are nowhere as good as what I am used to. Even top laners have more impact than an adc without a good support. As an adc, you just have to sit back and farm until your support makes a play or the opponents make a mistake.
Sure ADCs are strong enough in pro play, but only because the entire team plays around them. In solo que, that is not the case most of the time. People do not draft or play around a potent adc. They won't listen to good shot callings. NA solo que is especially bad because our culture is oriented towards individualism rather than teamwork. I feel like it is simply not worth to play adcs these days. Heck, I have had way more success with Garen and Kayle when trying to carry my friends.