So are we not gonna address lethality Jayce? (IG v G2)

I know there's some of us that have been saying that lethality is broken in this game. For me, it's that and that there's not enough ways to counter it as an ad/mage. Plenty of armor items for tanks to build, but for ad/mage it's just and . "Hmm, let's add 3 items that do flat armor pen that can stack and not add any items that help counteract them." Sure they're not bad items, but it's so obvious and boring that those are the only items to build to counter lethality, and because of that assassins can then build items ahead of time that could then counter those items.

Sure there's also for mage assassins, but that's only 1 against the 3 that ad assassins get; which let's also mention that each of them significantly help assassins kill even faster. Morello just does some flat pen and reduces healing, cool. I'm not asking for more flashy flat pen ap items to fill the quote of ad lethality items, but why dump everything into assassins hands to kill so easily?

But anyway, back to the topic. How is Riot going to react to this? What would they say to defend that lethality isn't broken in this case? Sure he built death's dance to reduce damage taken, but it also heals him incredibly and just adds to his damage. I guess you could say he was able to build this way because he got such a huge lead, and it's because of that lead that no one was able to farm enough to get an armor item. But wouldn't there also be the possibility that the lethality helped him snowball? At 23 minutes, TheShy was at 3/1 with 2.5 lethality items, after the long drawn out team fight he went to 6/1 easily. His autos would tear through turrets and his Qs decimated G2's health; after the team fight his overall damage was almost 26k. So please tell me how lethality isn't broken after that?

If Riot is balancing around the pros, then here's a good example of the use of lethality in the pros. So will Riot do anything about it?