The factory certainly don't. Many people homebuilding dress up the edges of the sheets to get a much better finish. Many of the lightening holes get buried in the structure so most wouldn't bother. Many of the frame parts can use a bit of a dress up to more evenly support the sheeting.
In a full time six week build that I was involved in, there is still time for deburring, I have no idea how long a factory build actually takes, perhaps 4 - 5 weeks.