Storage is one of the most expensive things, both in film/TV sets and in publishing.
Sometimes a publisher accidentally overruns the number of books printed. Ordering in huge quantities drops the price per unit very low, but if the books will spend too long in storage, a publisher will sometime
pulp what is left and reprint them if the shops suddenly require more. It seems incredibly wasteful, but wasting money on storage is worse.
Haven’t rewatched any ENT since it ended in 2005, but wasn’t the NX-01 Enterprise bridge based around the USS Defiant bridge set?
No. The soundstage was
completely cleared after VGR wrapped production. Underneath the
USS Voyager bridge was TNG's battle bridge, which of course had been the movie
USS Enterprise bridge. When they stripped it down, underneath was the
"Phase II" bridge's support beams, riddled with wood rot, having been in situ at Paramount since 1977 and later modified for TMP.
New panels had to be created for ST V because the consoles were left out in the open, under a tarpaulin, to allow the ST IV bridge to become the
Enterprise-D's battle bridge (and the
Stargazer bridge) when a huge storm hit.
The support beams under all the set pieces were marked in black felt pen,
"Star Trek II", the original title of what later became known as
"Phase II". Uncovered when prepping for ENT.