Honestly this gets me too. Hack is a little frustrating to play against, sure, but it’s not exactly an instant death sentence. I’d be more scared of a flashbang into fan the hammer or a sleep dart into shot/grenade/melee.
With a hack my target still needs to close the gap, for the most part my movement isn’t inhibited and I can still use basic attacks. There are some heroes as well that are just not worth hacking. For example I’d probably almost never hack a Zenyatta or Widowmaker because their abilities won’t contribute as much meaning to the fight as say a Pharah or a Genji