Any reason you chose to "buff" ie like this instead of say giving it more AD or anything. Or AS or MS to match gale?
The biggest complaint I saw about IE was it was mediocre early. So buffing it's late game and nerfing it's early game doesn't seem like it'll help much unless you just want Galeforce to be the early game crit mythic and IE the late game one... but I could just see it devolving to people buying gale and at 3 items selling it for IE. Or something.
It's a buff.
You shouldn't buy IE first. That's obviously a bad idea for an item that multiplies your other purchases. Most players have thankfully realized that. It's essentially equal on 2nd item and immediately better the instant you buy a component of your third. An item that is always equal or pure upside is a strict buff. You don't need sarcastic air quotes. It's a buff.
IE is already more performant than Galeforce on a large swath of champions. This is the same issue Statikk Shiv has on AD characters: It's good and players are wrong to claim it's weak.
But because they're wrong, it shows up in the patch notes to say, "No really, try it!"
Also ADCs aren't weak. They don't need a significant amount of extra power. But it's good to re-shape them away from Galeforce as the most common mythic. Ironically, pro players are much better about skipping the active item for the power-positive options that already exist.