Worldbuilding and form vs function,

[Patroklos]

Its possible replicators require maintenance and upkeep of the type not available to Voyager due to parts/whatever. So you save on its operational hours for when you really need it.

Nothing about Voyager ever really screamed "lost with little resources" other than them talking about it all the time. There was never a wall panel dented nor did the ship get dirty from lack of supplies/stardock support. No matter how many times the consoles blew up they were always brand spanking new next episode. It would have been nice if the hull visibly showed wear over time in each obligatory episode opening space shot/monologue.

[Crazedwraith]

Redoing stock footage is expensive. That's why even BSG much latter only did it a couple of times a series during big events. They also tended to damage bits you didn't see in the stock shots.

Set dressing would have been easier though, I imagine.

[Elheru Aran]

Set dressing would definitely not have been difficult to alter and keep up with between episodes-- the question would have been consistency.

As for redoing the stock footage... well, certainly not between every episode. But perhaps every other season or so, take the Voyager model and bang it up a little. Something like that. I can't remember if it was still filmed with models or if it was the first show of Trek to go entirely CGI.