Why are adcs losing all of their downsides in preseason?

More access to crit. And I mean A LOT of items have a generous amount of crit not just 10%. A massive amount of life steal options, stackable blood thirsters and mercurials with 12% life steal is all I will say about that. And as if crit RNG doubling your damage or giving you 250% damage on your auto attacks, which mind you does give you more life steal because it is extra damage is simply not enough for you why not add a mastery with 15% healing on each crit. Like WTF? And to top it all off give all those ADC's a good amount of extra AD at level 1 because "OH NO THEY LOST 15 DAMAGE ON IE, AND 5 ON BLOODTHIRSTER". The only way to stop them is to buy this wearable cardboard that Riot calls armor and still lose because they are going to be just that ridiculous.