We never cut overlaps between graphic panels. On trucks, we cut where the aluminum panels overlap so the vinyl doesn't tent. On some vehicles we print the graphics per vehicle part in order to avoid having any overlaps on the graphics and we charge a premium for that.
get used to printing the minimum amount of overlap that you feel comfortable with. That way you minimize the chance or necessity of having to cut them.
JC1 has a good process but it's not very vinyl efficient. It puts a out a nicer final product but uses more vinyl I'm sure, but some customers won't want to pay for the extra vinyl usage just to avoid panel over laps.