Why is riot making damage creep higher

With the new runes riot is making damage creep higher than before this is bullshit

Thunderlord's decree 10-180 + 30% of bonus ad + 10% AP already pretty strong. Now we have electrocute 50-220 + 50% bonus ad + 30% AP

The cooldown is higher and things like Gangplank ult and Zyra plants can't apply it instantly, but the damage is still so much higher than before.

Dark harvest is a new keystone is going to be awful for the game all it promotes snowballing and if you snowball your going to one-shot people no joke and if you don't snowball then it won't be very good. Combine this with ultimate , Q auto , E and it's actually awful to play against I've played with it on the pbe multiple times and it's unhealthy for the game.

It's not just the keystones that are doing a ton of damage, but the masteries/runes too. The mastery merciless is being buffed from 3% bonus damage against champions that are below 40% health to 10% also if you get a kill you get a certain amount of ad/ap for a few seconds. Why such a big increase in damage I don't understand.

Sure its going into preseason, but I'm concerned about the balance of the new runes hopefully before the new season starts riot can make everything not one-shot