Why the Lissandra nerfs?

Riot nerfs the health growth of Lissandra... But why? In no way is she overpowered. Her win rate in NA solo que has been hovering 49-50% for the last several patches. It takes AGES to nerf tank Ekko a whopping 4 AD but Riot also thinks a large damage nerf is warranted to Shen. Her winrate in the competitive scene is entirely dependent on the region and team skill. It can vary from 37 to 67%. http://www.gamesoflegends.com/champion/stats.php?id=49&season=S6&split=Summer

Like Shen, she is being targeted because her effectiveness can soar with great team coordination or fall flat when it's not there. She's already high risk, and her trade off for a bad initiation is baiting your team into an unfavorable fight. Isn't she performing like you want her to at a 50% win rate in the competitive scene? One thing i hope you realize Riot is that it seems you nerf champions who appear in competitive play just because they exist on broadcast but then when they stop being played on-stage, you buff them back up (cough Lee Sin cough Lissandra ultimate heal). Meanwhile, everyone who just plays for fun has to put up with your b.s. reasoning in every patch note.