Fiora's Ult shouldn't heal upon finishing. Instead...

Uh, the point of the theme is she's doing a tournament duel in front of a crowd, and when she wins the duel by either killing them or hitting all 4 Vitals, the crowd goes wild and cheers her on (the AoE heal from crowd in every direction).

But there would be no targets because everythings dead...

I don't know why someone over there didn't come up with this.

It would look awesome as fuck and goes better with theme than aoe heal, which they admitted 'that's all we had left in the tool box' or some such rubbish when they re-released her.

Hell no. I don't need Fiora to dash around, getting four procs of max health true damage, that heal her, only to have become untargetable and murder everything.

If you want to talk about theme then it triggering her old ult would be better suited.

It would also be more exciting to see.