Which specific are you following the v18.1 patch for? Patch 11.18 notes - League of Legends
Developers rarely admit they over-nerfed something. In v18.1, you will see a line like: "Increased base ammo capacity for the 'Thunderclap SMG' from 25 to 28 (up from 25)." This is a placebo buff. The gun is still bad, but players will try it again for a week. patch v18.1
: Updated team tactical setups and starting lineups. Which specific are you following the v18