Two features I use all the time in Illustrator that I really miss in Figma are:
- The ability to rotate guides
- The ability to convert any arbitrary shape/path to guides
I currently work around this issue by just drawing regular paths in a layer, giving them a thin cyan or magenta stroke, and then locking that layer, but there are some obvious disadvantages to that approach, the main one being that when using the pen tool in a different layer, I can’t snap to the lines/points in my “guide” layer, so I basically need to eyeball the alignment.
Some common use cases for arbitrarily-shaped / rotated guides include iconography and perspective drawing, but it’s quite useful in many other situations as well.