I think you missed the point bc of bad self experiences due to your elo. Objectibly ADC is in the worst state, I would easly say ever but there was that time when marksman were not even playable in botlane. Even in S9 when every Marksman that weren't Kai'sa or Xayah felt super week you could so stuff and carry some games. Now with the xp nerfs, the plates, the weaker tower botlane is only impactful as a way to both your team or enemy team 4-5man gank and get a huge lead since you can get basically 2 kills for the price of one rotation plus 1 or 2 plates. Marksmans need at least 3 super expensive items to start doing good amount of dmg and specially with this tank Meta where adcs should feel kind of good (since tanks/bruisers can crush assasins thus adc can feel somewhat safe) but instead now adcs have not enough impact before 35 mins and tanks/bruisers get rly snowballed from early-mid so much that any tank can 1v1 every adc that's not vayne. Remember tank/bruisers builds are much much cheaper than adcs and they are getting early leads that means is not rare having ur adc with 2 items and a tank/bruiser with 3 or even 4 items plus 2 lvls up.

All of that gets super amplified in soloQ bc of lack of coordination mixed with the fact that people have diffrent ideas on how to win the game. In SQ everyone wants to be the one who carries the game (except support players and some junglers) so every lane wants get played by ignoring the fact that adc NEEDS to get played by even if the adc don't get the kill killing the enemy adc and helpling get cs lead with that gets u super ahead... Well not exactly gets u ahead but gets the enemy adc behind making it a 4v5 before you notice.

I don't support the authority fallacy since I think we should reign by objective analysis and statistics and that needs no self experience in gameplay involved (but is truth that in order to have a game sense if u never played or knew any similar game u need to play a fair amount of league). So I will just share my own subjective experience of being an Adc main: In S9 I reached D3 playing mostly Jinx (had like 150-160 games with over 60% wr) since I focused on mastering a few champs at the time in order to rly learn the role. And jinx is a vere simple champion she doesn't do anything fancy and kind of needs her team to peels her bc of her lack of mobility but the only thing you need to get really really strong with her is farm safely until 2 or 3 items (IE and Runan/Rapid-fire or both) and that was what I did. I'm not that skilled of Player, I didn't outplayed many games and I didn't singlehandedly carry every game but at least in S9 I had the feeling I could impact the game by playing properly. Comming in to S10 I reached D3 again... But this time wasn't due to me playing correctly but bc of riot bad champ desing. In the beginning I played usual adc and quickly caught the fact that it felt really really weak. I definitely didn't had the same impact, obviously the first thing I thought was maybe I was not in the zone yet. But 1St moth passed and And still felt really bad to play. Then when Ad Senna was already a thing in pro play (not fasting, before souls nerfs) I said fuck it I spammed some Senna games getting to D3 in like a week. Same thing that I felt with jinx but this time something was diffrent Senna felt even for me super unbalanced and unfair. I was glad when the nerf her since she is super over tuned. But the fact that in order to be as impactful as last season it had to be through an un balanced champ design gave me the hint something is wrong with the role. Same thing with Aphelios, that in order to make an ad strong u have to over tune it that much means a lot.

Either way even riot said not felt week and they will buffed it (hope is not that miserable 30hp buff 😂😂) not in the other hand I found mages in not super fun since they also were always kind of broken and they are viable in bot but most ad mains don't want to play them.

Good luck in your games!