When I was a child I saw a few movies in theaters in color.
And I watch B & W tv including many movies on b & w tv. I eventually learned that there were color televisions and even saw some programs on one once in the hospital.
So it was a big surprise to see to finally see Star Trek in color instead of greyscale. And to eventually see 1950s science ficiton movies that I assumed were black and white in color.
I liked the The Addams Family more than The Munsters, for various reasons. For one thing, I had a desire to live in the Addams mansion. If you could livie in the Addams mansion, would you prefer that it was in grayscale or in color?
It probably would have looked cheap in color. You can cheat a lot in monochrome.
On the other hand, it would have been funny if it looked exactly the same in color as in black and white!