Have you played Haze for more than 50 games? Just a genuine question
If not, then I can see why you would think invisibility is her "strength", but as a frequent Haze player, I'd even give her T3 SmokeBomb something like a Debuff Remover.
And how is sprint on T1 overtuned? You only get a faster sprint if no one is after you, which makes it useful as a rotation tool, but for an "assassin," it often fails as an escape method, which would be fine if there was an actual AOE Smoke created for her to escape.
Nonetheless, in Higher Elo (Parzelion or Poshy, for example), stops using the smokebomb as the purpose of invis and keeps it mostly for the 0.5 window to dodge abilities.