So don’t do water intensive farming in Nevada?
The point is desalination isn’t some magic fix that makes everything ok. The remaining salt is probably the biggest issue.
No, but it is a whole lot easier close to the sea. Like most of UAEs cities are. The remaining salt, you could just pipe out in the ocean, if you go in some km towards a current and spread it out enough. Salt in the ocean is only a local problem, if it does not diffuse quickly enough.
And for deserts with a high altitude or that are more inland, no, desalination is probably not the solution.