I loved my HDR and Kar98k back in verdansk days, but I do 100% agree in wz2 oneshot sniper would be too op.

1. We don't have movement like slide cancel to make myself a harder target to hit. The dolphine dive makes me a easier target cause I was forced to prone for half a second and for a good sniper that's all they need for a headshot.
2. Full auto guns are not great for longer range. In wz1, weapons in general have lower recoil and higher dmg at range. So even if I'm not using a sniper, I can still challenge a sniper, hit him and make him flintch. In wz2 high zoom optics are not as good as wz1, there's too much visual/actual recoil at range. It's very hard to challenge a sniper with a full auto AR/LMG, if a sniper can one shot.
3. Not enough buy station/Self revive not avaliable at all buy station. Back in warzone 1, when you sniped someone from afar, the downed player can get behind cover and self revive. Even if you call in a precision, the self revive is still faster than a precision. It's a way to make sniper rifle more balanced.
4. Snipers are too power in this game, stat wise. Currently, heavy snipers like victus and mcpr can reach 1500+m/s bullet velocity when you have the max build and tune for bullet velocity. This is a lot faster than wz1. I think the HDR in wz1 had around 1100 BV.

I do think that if they want to add back one shot sniper, they need to also make a lot of other changes. Add movement, reduce visual recoil and make higher zoom optics actully useful, add more buy stations and make self revive avaliable on all buy station, nerf the bv of snipers, etc.