This is something that I've suggested on several occasions. In fact I suggested that very new members should be restricted in posting in some threads as well.
Here:
restrict accounts below "Member" rank from creating new threads
Any account having a rank below "Member" should be restricted, and that includes very new members as well, of course.
It sometimes looks like the OP of some threads doesnt know how to or doesnt want to use the search function in the forum.
There are so many threads thate essentially duplicates of other ones.
Exactly. Eventhough every little information about the things a new member would want to know are already present in some (or many, sometimes) old thread, and most of them are even pinned in those boards, but they still post new threads asking about the same thing that is repeatedly asked about 200 times before.
There are hundreds of them. Someone would run out of space if starts to gather all of them at one place. The only way to stop them permanently is to restrict their accounts. If you want to kill a tree, you need to cut its roots. Cutting its branches won't help as it grows 2 more if you cut one.