+1
Crossbows shots would only curve in extremely long distances.
Yeah, to be fastidious about it for the scale of these maps arrows should be basically straight too. The arc should be barely perceptible.
But hey, as I said, one thing at the time and differentiating them a bit may not be a terrible idea.
On the other hand, no way around the fact that on the small scale a crossbow bolt is basically as straight as a bullet.