Serious question: why don't assassin's buy critical strike?

I seen some high elo players and streamers buy crit on assassins such as Zed. It proved to be quite effective, as specially for Zed when he was able to crit for 1.3k dmg with bonus passive dmg. What do you guys think?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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