Well- you ask a good question--in theory we would hope that one does not have to go there. But at times I find looking thru the code useful. With my CNC printer I catch some things that way.
One thing I immediately noticed (and others did) is that Prusa "seems" to take about double time compared to Fusion or Cura using similar print parts. Having a look at the GCODE each generates may be revealing. (Aside: One nice thing that Fusion does, is print the time for each layers so you can look for costly layers).

In the end I suppose it is academic--just knowing some of the underpinnings. But to your point, 3D print is not my field and I suppose I can spend too much time on it!

thanks
Fritz