Sett's numbers are too high
https://lolalytics.com/lol/sett/?lane=top https://m.u.gg/lol/champions/sett/build
He has both the highest pick rate out of all toplaners while also having the highest ban rate and the highest win rate to boot. Sett's kit is perfectly fine but his numbers are just way too high. He doesn't need any kit adjustments but he does need hefty numbers nerfs.