In the old studio days when they were cranking out a lot of films--many of which were probably fairly similar in style (e.g. Westerns)--it probably made more sense. I assume Netflix is mostly just writing checks to independent production companies. There's an overhead to storing and cataloging a bunch of props and I'm guessing there isn't a lot of return for Netflix to do so.

This is also a long standing production strategy for Star Trek.

One of the reasons the original series had so many episodes where they went to a planet that was just like Earth in some specific time period was the availability of props, costumes, and even sets. Entire episodes were written around this conceit: there's the episode where they land on a Nazi planet, the episode where they land on a Roman Empire planet, another episode where they meet an alien who turns out to be the literal Greek god Apollo, an episode where they land on the planet of the Prohibition-era mobsters, and an OK Corral episode just to name a few. From TNG onwards, the holodeck was used for similar purposes.