People like to say this all the time when they dont play her. So often when going for a pulse you are blinking into the enemy team to try and hit it, and recalling right away. You cant just shoot them a bit before or after pulse, thats not how it works most of the time. And lets also not forget that most pros were sitting around 50% stick rate, while aiming for tanks often. Or looking at the ladder its 2.22 sticks a comp game. That is very low for how long games are and apparently getting a bomb at least every min. And even pre nerf on ladder had the 2nd least amount of kills from dps ults, only ahead of doomfist.
Also tracer has always been a bad pick at most ranks, and people didnt even complain about pulse bomb dmg till blizz said they nerfed it cuz it was doing too much dmg vs tanks, but I digress.