If I ran the balance team I would provide real nerfs to marksmen.

But you don't...

Are you planning this as your career?

Well then we are lucky you arent.

Maybe, just maybe, they don't actually need true nerfs?

They're being nerfed against every squishy, effectively. Lifesteal (a stat that's shitty against burst) is being buffed, IE is being changed from more crit damage to true damage conversion (a buff against tanks, a nerf against squishies). Sure, LW is going to punch through total armor instead of bonus armor, but squishies don't tend to have high amounts of base armor, anyways.

And, of course, they'll be weaker before finishing IE. All crit items are being made more expensive, IE is getting the shittiest build path for an ADC item ever (requires two BF swords, which are the most expensive base component in the game, beating NLR by 50g), locking you out of grabbing a Pickaxe if you need to back early, meaning you won't have any AD from items (except Cull/Doran's) for a while. Meaning they can be punished earlier. And they're stuck with 30% crit until they finish IE.

It's a power redistribution. Don't pretend it's a straight buff. They're being buffed to handle the absurdity of tanks, while being nerfed overall against burst champions (again, with the exceptions of GA/Maw buffs (But most ADCs get QSS over Maw, anyways) and LW going from bonus to total penetration).