FYI: Critbased adc's are still the best lategame scaling champs and therefore shouldn't be buffed
The adc patch was very succesful in my opinion. The fact they aren't performing well at the moment has a lot of causes that isn't directly tied to their kit, base damage or items.
- They are the natural predator of tanks and tanks have been overnerfed and hardly see play now or just build full damage.
- Their natural predators the assasins have received several buffs for several patches now
- Supports got nerfed
- Turrets got nerfed and Baron is weak. Adc's are no longer needed to take objectives.
- Snowball is out of control: The game is already decided before the crit based adc got time to collect his items and scale into lategame
So yes, in an environment where the champs they counter don't get played and the meta is focused on early game and objective control it is obvious crit based champs won't do well. Buffing them would be terrible because it would mean to go back to square one. They would either scale faster or become better in early game and become stronger than assasins etc.
I would rather see indirect buffs that aslo improve the overall gameplay like reduce snowballing, buff towers and buff tanks so crit based adc's have a place in the game again rather than straightup buffing them and going back to square one regarding adc's.
edit: Instead of buffing tanks the amount of true damage in the game should be adressed and rageblade

which then has next to no defensive stats to pair with that regen, but with its active it is easily the single best tank item in the game currently, which say a fuckton about how much tank items have been utterly fucking annihilated. Even if you have massive HP regen, its out of combat, like Ocean Dragon or Warmogs, and utterly useless in the fight which is the antithesis of how it used to be, with HP regen working for tanks to counter the lifesteal and spell vamp of damage classes. ADCs still treat tanks as mobile fountains or HP batteries due to rune alone, let alone actual lifesteal items (which, of course, just got systemic buffs across the board +5 AD and -100g for virtually all of them) but tanks no longer have in combat regen.
or throwing a
into this build and calling it "on hit meta" was the most optimal build path for every adc.
who had
as her core item for most of her existence, was basically playing around assassinating enemies with crit builds, and didnt bother with a bork anymore.

literally doesnt crit and yet now her crit chance is more impotant because of
Blade call scales off of crit chance.
Mounting Dread scales off of crit chance and modifiers.