Critical for Accuracy

I'm not going to give any reason for replacing critical chance except that ADCs are better at being assassins with critical chance builds and 2-3 auto attacks (or 1 AA and an ability for some) then an assassins entire kit. When did ADCs become burst damage champions? They should excel at dealing late game consistent damage but the way critical chance is balanced ADC start dealing burst damage around the mid game instead. We need ADCs to do what they are meant to (deal insane late game damage) but not deal it all up front to really help balance them.

Accuracy: Deal increasingly more damage the longer you can see the enemy

Damage ramps up to a % bonus over a short time 2-5 seconds not sure what would be best balanced but I feel it should be quick so I would lean towards the lower end. This is a solid damage bonus and it tracks damage individually on each enemy champion within the ADCs personal sight range and not just anyone's sight range. I would suggest that the damage bonus once in late game build have a higher bonus damage potential then a regular critical attack damage. This is because they have to ramp up over a short time to deal the insane damage and they will be even better at dealing with tanks but susceptible to assassins as they won't have access to their full damage on them for the first few seconds of seeing the assassin.

This would add counterplay to Auto attack base champions (mainly ADCs) by controlling vision of bushes and rewarding short term stealth based champions like Khazix that can break vision for a short time. it would also be thematically fitting as these champions are often represented as champions that use long ranged weapons that reward accuracy. If the "archer/sniper/gunner" loses sight of an enemy they would have a hard time "hip shooting" at them right after they appeared in front of them. This also rewards clever flanking tactics in big teamfights.

Anyway, it might not be the solution but I would love to hear what people think of this idea. Obviously some ADCs would need to be tweaked to work with this new mechanic but do you think it could (in theory) work at fixing the ADC problem? Its just my rambling thoughts and I'm by no means an ADC main but would value an ADC main's take on this idea or anyone's for that matter. Is it close to a working solution or totally a bad idea? Could a few tweaks to the idea make it work? Post a thoughtful non-insulting post and I'll gladly respond.