And inexpensive in the set and wardrobe departments.
Sci-fi shows made nowadays have three big advantages that did not exist in Star Trek's day:
1) CGI and other computer-based tools have become amazing, fast, and affordable. There's just no comparison between modern scene extension versus having an old 2-D matte painting composited into a static shot. And that's just one example.
2) Even after adjusting for inflation, there is a lot more money in TV budgets today. This is because technology has increased the number of distribution channels through which a show can make money (home video, streaming...), and because international markets generate a lot more revenue than they ever used to.
3) Today's genre shows make fewer episodes per season. They must have more time for each one.
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