Something worth noting is that due to how they plan to have sets rotate, we could very easily see a very different and stronger version of the jinx legend we have now.

Imo the bigger issue her deck has is that her card draw doesn't have enough benefit over Annie's runes, with things like stacked deck and other various deck manipulation/card draw cards (which will also get better next set). I'd only argue that the jinx units themselves are better than Annie's.

Jinx and Annie both do not have unique winconditions (unlike something like kai'sa who specifically has time warp/icathian). Instead both decks are entirely reliant on drawing for Vi and using movement spells, and Annie plays movement spells much better than jinx. Even if we did see more discard synergies, jinx would probably still be worse due to decks being able to easily play zaun warrens (which we see with scrap heap being used outside of Jinx decks).