not completely untrue. bursting people down and burst damage aren’t one and the same. you can burst people down with a stream of sustained damage. when I say burst damage and sustained damage I am referring to individual heroes way of outputting damage. out of the 4 ranged hitscan heroes (excluding bastion bc he obviously has the highest damage output), mccree has the lowest average ttk with 0 healing (over different health pools). which is followed closely by soldier, then ashe, then widow. widow is only #1 on 200-250 hp targets. the reason why the sustained damage hitscan (soldier) is worse than those that he has a lower ttk than in actual games is because of healing and armor. armor hurts his damage more than the others and healing interacts with armor hit points the exact same as shield and health hitpoints. soldiers damage is nerfed for longer than every burst hitscans because of this.
its all relative. tracers guns are a sustained damage weapon relative to something like reapers, yet compared to soldiers its more of a burst. your example means nothing because you are effectively saying “this character killing faster is better than the same character killing slower, therefore sustained damage < burst”.