How necessary is Plastigauge on a "simple" rebuild?

[area53 at validpath.com (Jeff Toomasson)]

I know the stuff is cheap and probably the answer is obvious, but I wanted
to double-check what the consensus is.

This is an ABA shorty with all interals in great shape (minus one piston
which has been replaced thanks to Mr. BoxOParts). New rings (std.), rod&main
bearings (std.), rod bolts have been purchased. Is using Plastigauge
anything more than just reassurance if I didn't have any machining work done
to the crank?

Thanks, Jeff