Let's face it: Riot would sooner shoot itself in the foot than nerf Lee Sin meaningfully
We could suggest all the appropriate nerfs we want, and they'll give absolutely no f#cks at all because he's Lee Sin. Simple as that.
Heck, I've got a few that would be meaningful right here:
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Change Resonating Strike so instead of dealing a % of the target's missing health, it deals damage up to a cap based on missing health. This lowers his free damage against high-health opponents.
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Change Tempest/Cripple to no longer reveal stealthed opponents (still reveals non-stealthed enemies). If Lee wants to expose a stealthed enemy, he should have to successfully hit with Sonic Wave, not just mash E in the middle of Akali's shroud.
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Lower the base damage of Dragon's Rage significantly, and give it a higher bonus AD ratio. There, Lee can't do good damage with his ultimate unless he builds more than one AD item.
But you know what? Riot's not gonna give any sh!ts about them even if I went into good explanations. It's been their track record so far.