All non-explosive projectiles should have falloff. It makes no sense that they don’t.
Due to the travel time of projectiles, long-distance headshots are more likely to be the result of luck. The fact that OW rewards luck with OHKs makes spam unreasonably powerful in my opinion.
On the other hand, exploding projectiles should have no falloff since the damage doesn’t come from the impact but rather from the explosion that occurs once the projectile reaches the target. Just my thoughts anyway.