Solo queue and Pro play are never comparable so ever referencing pro play in relation to solo queue is asinine and pointless. As I have said multiple times and will continue to say until my fingers fall off and I'm blue in the face, pro play has a team of five people who live together, eat together, train together, and communicate together in game. Just the communication and organization of the team means that champions that are usually hot garbage in soloqueue(Ryze, Azir, Galio, Shen, just to name a few) are suddenly amazing, which is a consistent problem.
Solo queue slaps five monkeys together and let's them lose. They dont know each other, they arent in call, they haven't trained together; its flatly better to pick things that can self care and dont require a shitton of teamwork to actually function.
ADC inherently will always do better in an organized setting than in a soloqueue one. Some ADCs even have such game impacting utility that they are favorites in proplay, even when they're weaker in soloqueue(varus, ashe, sivir). As a class, its intensely different and better to be able to communicate directly your cooldowns, your position, if you need help to your support and tank than to only be able to ping desperately and hope they're paying attention.
And bringing up Rekkles doing well on Tristana is stupid; he practically OTP her, shes his favorite ADC, of course hes doing well on her. Shes got a terrible overall winrate but mains are doing fine with her, as they should be since they put in the work and effort to learn her.