devtrackers.gg
The reason the nerf was important is that it meant it's more optimal to use other mythics now, and its defensive shield was less strong since it was frustratingly strong. Yasuo and Yone may have gotten marginal damage buffs but the fact that they were so hard to kill with shieldbow is what's been nerfed.
The nerf wasn't Riot going "we just want shieldbow users to have a lower winrate lul".