This is where you are wrong, 3 headshots is mindbogglingly preposterous. A headshot should result in a kill period, A player should be rewarded for pulling of the hardest type of shot in a shooter. CS, Valorant get that and that is the reason they are so popular
There is no wrong, its just different. Destiny didnt give you a one headshot kill either with Handcannon. Played it for hundreds of hours. Or Halo. Headshots take more damage though.
It fits in with people who are more use to being Destiny PVP. And Im pretty sure Ive been one shotted by a sniper a couple of times in Concord, I hate going 1 on 1 with her.
CS and Valorant arent Hero shooters. Well Valorant has powers and hero shooter aspects but more in the line of CS and Rainbow Six. Its all about the objectives, bomb etc.