give me one reason RNG crit is better than damage amplification

Crit is different in that crit also scales off of AS in a bursty way. If it was straight autoattack damage amplification, bruisers and assassins can use it too; they seem to want to keep crit a marksman primary stat rather than put it on all autoattackers

A rioter pointed out many but heres one. 1.Gives an adc that is behind a small chance to crit in a fight and turn around the game.

It's to add a little bit of chaos into the game. But some measures should be taken so that a player doesn't win the lottery and crit 10 times in a row on a 5% chance.

Dota 2 (for example) has systems in place to balance out RNG so that you can't be extremely unlucky or lucky with % chance mechanics. The longer you go without triggering a % chance, the more likely it's going to happen. And each time you trigger it, the chance resets to something lower than the displayed values.

Makes unpredictability a factor, and luck, a blessing.

The RNG god giveth and taketh.

Just played Ashe that always crits for reduced damage. It just doesn't feel the same.

One thing: reliability.

To reliable score critical hits, you need dedicated itemization for it. This means you need to itemize at least two offensive items, creating a big gap between crit-based and non-crit-based gameplay.