That’s kind of the opposite of what we see in practice.
New users usually don’t search at all and post a new topic even though one suitable for their purposes already exists. The lazy path is to not search and just create yet another duplicate topic.
So while I can see this setting would be useful in some narrow circumstances I am not really convinced it’s a good idea in general as it blocks and suppresses some behaviors you actually want new users to engage in – search before creating a new topic.
We typically block new topic creation on sites, e.g. require TL1 to create a new topic, that’s already possible.