Well just remember the holodeck had a power system that was incapatable with the rest of the ship, obvioulsy transformers/ power converters are a lost tech. After all I charge my DC powered phone from an AC supply.
Which is... stupid. We can integrate Borg systems, on DS9 Bajoran/Cardassian/Federation systems all work seamlessly, we can integrate Janeway's future godmode armor and torpedoes... but one part of the ship can't work with another part even when they're built by the same people and the same type of technology?
Which is more likely... that, or they just wanted to pretend they were roughing it while having their safe holodeck episodes to fall back on?