system
Given the following post, respond as if you're commenting on Reddit:
human
[Star Wars] Are Resurgent Class Battle Cruisers just refurbished Star Destroyers?

The Empire was said to have had around 25,000 ISDs in total. It is stated in tne Aftermath trilogy that thousands of ISDs went into the unkown regions to join the First Order. Then 25ish years later the First Order has a giant fleet of Star Destroyer-like cruisers. Is it possible they just built more onto old ISDs? I think it would explain all the empty space inside them.
gpt
The *Resurgent* is an entirely different class, and nearly twice the size of the *Imperial-I* and *II* classes (2900 meter length compared to 1600 meters) and required twice the crew. Not sure where you're getting the idea that there's a lot of empty space within them.