One of the biggest drawback for shrink wrap is usualy ESD concerns.
ESD is not too bad for fabricated boards but companies do not like to
see this stuff coming into their factories.  If it's assembled boards, then
this is a no no....I think there are some materials like poly which 
do not build up a charge, but this is usualy vaccum formed and to the
correct configuration of the assembled board.`
I have shrink wrapped assembled boards to keep components in place
before wave soldering and what happened was the material formed around
components, tough to get off, and this was before ESD became known as
a problem. Wouldn't do this anymore.

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