I dont see any reason for adc's to snowball harder than any other class
They're already the best class in the game when it comes to lategame, People complained about them saying "when will adc's become viable" like no shut up, you've been viable since season 1. Unless an adc isn't picked anymore in every game, then you can complain about not being "viable" I find it ridiculous how much more an adc can snowball more than any other class.
These champions aren't having any issues.