What iniside said - it all comes down to how much realism a game wants to portray.
If its a action oriented, over the top shooter, who cares?
Use hitscan/traces.
It may even be a good way to balance out the different types of weapons.
If its a close quarter oriented shooter, it won’t matter.
Use hitscan/traces.
If its a somewhat realistic shooter with some decently size maps, basic bullets would be ok.
Use projectiles.
If its aiming for some degree of realism and has the potential to have mid to long range engagements, decent bullets physics are a must.
Use projectiles with simulated trajectories, air resistance etc.
@iniside: Yes, dodging a bullet doing a 1000m/s at 100m - not gonna happen.
Reaction time for humans just isn’t good enough.
That said, a target already on the move at 2-4m/s would have moved 20-40cm by the time it takes the bullet to cover that 100m.
And it doesn’t take much to miss 