They were created and added because they had needs to satisfy.
They might not be much active now, doesn't mean they should be scrapped.
If they were needed then, there's a likelihood they would be needed later on.
I have to say, I'm fed up with the sheer quantity of sub-boards on this site. Hundreds? Are you guys serious? It's like trying to find a needle in a haystack, but the needle is on fire and the hay is being blown away by a hurricane.
Ironic that the hundreds of boards makes it easier to navigate the forum and help in organizing of threads.
I won't see anything wrong if some are added