Why does Shaco's backstab not stack well with crit, but Cait's headshot does?

And people try to claim Riot doesn't show any bias towards marksmen. ___________ Cait (ranged) gets bonus damage, Shaco (melee) gets penalized crit that gimps actual crit damage. Needless to say Cait's has better base damage and better scaling. Cait's conditions are far easier to meet, Shaco's can only be executed within a small window, and is near-impossible to execute on outside of that.
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