Champion are "balanced"

I'm really disappointed. I don't understand how champion designers ruin such a great game like League of Legends. How are you going to tell me that a Kindred can go 4/0/1 in 6 minutes by building 2 Daggers and challenging smite and it's balanced. This champion can build FULL attack speed and win. It is absolutely ridiculous. How are you going to buff champions that literally don't need buffs. Mundo, you buffed a champion that already did really well in lane and in the game. Now when i fight a full tank Mundo his E does 600 damage. His Q does 300. His W is tenacity and does good damage. His ult makes him unkillable late game. He didn't need a single change. Why on Earth would you buff Brand. He was already a really strong mid laner almost a little to strong in the first place if you ask me. But like seriously, he didn't need to add to his damage over time passive. You gave him even MORE burst. Just why. I fail to see any logic that comes from these champion designs and buffs. Thank you for reading i hope you fix your game.