The biggest problem with balance in this game( not a rant thread)

So I see many posts day in and day out about how x champion should be nerfed, x champion should be gutted, or x champion should be removed, x champion should be buffed. Riot doesn't seem to realize their biggest problem with the current balance of the game and their balance team for that matter.

The biggest problem is that they over nerf or over buff a champion, for example instead of slowly buffing Ryze into viability they increase the damage on his Overload AND increase the uptime of his passive to 6 seconds at all ranks, instead of just buffing the damage on Q Riot decided to give him goody buffs that he didn't need.

Now let's look at Kassadin, instead of bringing his ult range down slowly over time to find a comfortable spot they just gut it all in once to 450 range from 700! And they had to buff him pretty fast afterwards for their mistakes.

Now let's look at Katarina, instead of reducing her base damages on her Q and E, they decide to just gut her health, health per level and slightly increase her health per level by a measly 3, needless to say this fixed absolutely nothing as she is still very unbalanced, * her damage is the problem Riot, not her sustainability *.