Just read about “new desert planet Pasaana.”
It’s a minor thing, but if you want a desert planet why not pick Jakku or Tatooine, and if you want a new planet then why another desert planet?
I mean I think the simple answer is desert locales are always beautifully cinematic (and their iconography has roots in a variety of genres and mediums that SW is known for pulling from), and if they were going to go back to an existing desert planet there should be a reason why they were going back to that one specifically.
I don’t terribly mind an excess of desert planets, if I understand correctly it’s likely the most common biome.