I see what you’re talking about, and want to see them play so fast and loose with the notion as to take old noteworthy’s and heroships out of mothballs, triple the volume and call it a “refit” for nostalgia bait. But Trek does offer an interesting notion here that we don’t really have in real life in that there are core valuable parts of a ship more important and possibly more enduring than its hull. We don’t take reactors out of old aircraft carriers and submarines and drop them in new ships as some sort of legacy so the idea that it could arguably be done in star trek is novel.