The unbalance is real

Is there a reason why Casseiopeia can do 800 damage each time she uses her twin fangs? It is impossible to get near her and if you do she just ults you and you die. Cass is probably one of the top 5 most high reward no risk champions in the game. With people such as zed who can jump into fights being there at the top too, that is saying something. I notice that champions such as Cass with an outrageous late game and a strong early game are very annoying to go against making it want to uninstall the game rather than try to Fizz Troll Pole out of all of her skillz and miracuously zhonya right as she ults. The point of League is to have fun right? So why does it take 5 people to kill one Cass and still have a high chance of failing anywhere on the map?

Other instances do appear such as Zed and Vayne for being able to do high damage very fast without much risk, but none are as consistent as every Cass I have seen. At least both Zed and Vayne have clear counters. Cass you can't counter as you need at least 2 ppl to even touch her. Every champion in the game should be able to be killed by another champion in a 1v1. So if stuff like this keeps showing up all you will see is ranked willed up with the same 15 champions becuz they are broken compared to the other 100+. Don't we need diversity, especially when half the champions are barely played at all?