I would like to propose in the tour, to point out the importance of searching in the 'Search' for a question before asking it on SE. The questions come up time and again, an asked question or duplicate. Also the search box make it more prominent so people will see it better.
To me, the search box is incredibly obvious, in the same place most sites have it, and in the same format. Also, when you post a question, the system does a pretty good dupe search anyway - but getting someone to accept that it is a dupe is another matter...
Changing it would be a Dev activity, so I can't speak to whether we will get any changes to the tour, however, if it doesn't get changed, there is something you and I can do to help new folks:
- let them know about the search box if they missed it
If this is done in a welcome message, you can let them feel welcomed and educated as to how to ask in future.