For season 9 pre season and for the game stability do this !
Riot it is time to going back to succes to reunificate with money uh... i mean players !!!
So this time instead of going threw pbe or the classical testing procedure do this :
Take 10 no life players guys which play around 5-10 games per day and make them play the next season changes during one week , reward them with a skin and an unique icon :
2 bronze 2 silver 2 gold 2 plat 2 diamond
Make them play together and wait for the feedback before making live changes.
Or perhaps take 10 players of the medium level elo gold/plat.
Cause those players are dedicated tonthe game and are kinda sort of hard gamers 5-10games per day. They will find quickly what should be ehanced nerfed or improved for new meta and new season.
You will avoid many hate and complains by doing this.