Ya you could do line traces instead of projectiles but that won’t always work. I’m building a tower defense blended game so not all projectiles fire in a straight line or at constant arcs. You also can’t simulate physics with line traces giving bullet drop over distance. Line traces are also instantaneous which won’t work for mortor or artillery type firing.
Collisions are of no concern, simply make a custom object type and have the projectile ignore the collisions on that channel.