SE can't create a "how to play [job] 101" tutorial in-game because that's going to change every time they do job updates. That would end up a significant waste of development time on ephemeral content that frequently needs to be replaced instead of spending it on lasting content.
Players who want to learn can go online to look up the latest guides. They can start with the job guides posted on Lodestone for the basics then move to more in depth player created guides.
If a player isn't doing that, it's their choice. SE can't control their choices.
