as someone who has played the old and the new fiora a lot.
the old fiora was at best a worse assassin, than an actual assassin.
your only option to make plays was to dash into the enemy team, hope you dont get exhausted before you hit r and pray that you deal enough damage with your ult that you kill someone and make it back out before you die.
gameplay wise this new fiora has a lot more options to make plays.
even if you dont agree with her new passive, you have to agree that everything else in her kit is by far the superior design.
especially the old version of riposte was pathetic and only useful to get 100 ad at level 1 and all in cheese your opponent with auto attack resets at lvl 2.