But it will probably deliver better-looking results.
The gotcha with Offset Fill is that the laser cannot reach whatever speed you set for that layer, because it must accelerate and decelerate while following the roads. As a result, scorch marks will show up where it runs slowly, unless you can find whatever compromise power limits that work for that map.
Bonus: you’ll also find gaps down the middle of the roads and holes at the intersections:
Similarly, the caveats for Flood Fill are worth noting:
It’s worth trying, but the irregular fill trajectory will probably become noticeable along the length of a road and all its branches.