Why doesn't Ahri's charm cancel Lee Sin's Q damage mid flight?
Just title.
Just title.
It doesn't stop dashes anymore.
They removed that interaction.
Patch Notes 6.4
**Charm no longer stops dashes in their tracks.**
_ "Ahri's been strong for a long time, and it's not hard to see why. Her mobility, damage, and pick potential are all on the high end, playing a crucial role in her effectiveness. When assessing what areas to adjust, Charm stuck out as an area of inconsistency. While displacements (knockups and knockbacks) have always stopped movement abilities, stuns, fears and taunts do not. Charm was alone in this, and while having unique CC is definitely neat (both from a thematic and strategic perspective), it’s the fact that it’s on Ahri’s kit that we get into issues. Specifically, Ahri's intended to be a champion that uses superior damage and mobility to navigate deadly situations if she wants to emerge the victor. Instead, Ahri also happens to have the best in (and out of) class stopping power that negate some of her biggest predators with no real recourse."_
** E - Charm** REMOVED STONE COLD FOX: Charm no longer interrupts dashes (Charm will still apply after their movement ends)
They removed it about a season ago because people thought it was impossible to engage onto her when her charm is up, but you know IT IS A SKILLSHOT, and not point and click CC like a lee ult so you can actually avoid it
Because even though Ahri is overtuned she still has a ways to go before she can compete with the big man himself! 
Analyzing thread...
Initiate anti- Lee Sin banter.
Analyzing....
Initiate anti- Ahri banter.
Error.....Error
Initiate emergency shutdown.
People acting like lee is the only champion with a dash. Having to play any champion with a dash into ahri was fucking stupid and no there isn't a real way to make her waste it especially if that dash was your only way to get to her. Even a bronze can figure out waiting until you actually dash to use charm.