https://i.imgur.com/P4sYNqa.png
That's not even with the keystone. "Here's 2 B.F. Swords, have fun!" 72 AD essentially for free. Old runes with the meta setup gave ~12, and masteries gave a small %damage boost and some armor pen.
gathering storm: 28 ad in minute 30 isn't that much.
celerity: given the fact that it only converts 6% of mov speed to ad, you need to have 600 BONUS movment speed to get that much ad, which will make for 900 total mob speed. so your numbers are inflated
and btw: how did u view it? is it in the league client or some website?
I also didn't address the "70 more damage in a full combo, max" part. If a champion has 350AD and the runes bring it to 420AD, that's a 20% AD increase, not a 2-6% increase in damage dealt to the target. And it's a lot because it's not the only thing that's been added to the game to increase damage. There's the RFC proc, someone could have PtA on the target, ignite could be dealing 500 true damage, etc.
Let's ignore that you could get 68 scaling ad from runes and masteries in the old system along with other bonuses like armor pen, double edged sword (1.5% damage boost), havoc (3% damage boost), and 5% bonus ad.
