Why nerf lissandra?

everything in mid is super weak

lissandra and other stat checkers are rising

karthus is insanely op

Jatt: lissandra sees a lot of pro play –> let's nerf lissandra

The genius behind the balance team astonishes me as of late. Instead of nerfing champions that are not actually strong, why don't you (a) use your brains to actually nerf champions that are "conceptually" strong instead of "statistically" and (b) buff champions that change the meta so liss sees less play. It might be harder to do, but all the more reason why to do it.

P.S new to discussions, so I have no clue if I'm placing this post in the right area.