The answer is: It depends When you boil it all down all in the CNC world, all arcs are a series of short line segments. This is because the controllers are digital and the points on the arc are calculated by trig in the controller. The minimum possible move increment is one encoder or stepper pulse.
Having said that, if you have line segments that are 0.001'' in length or less on the drawing, then you would normally not see any faceting on the part. Line segments that are 0.010'' might leave visible faceting on the surface depending on the tooling, machine rigidity, and material. I think Fusion has a ''curve or arc fitting'' function that will smooth out segmented arcs.
You can machine a perfectly acceptable arc using only G1 moves rather than G2 or G3 moves if the line segments are short enough but this does create huge G-code files.