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Tableau is developping the data modelling side.
To join tables together you can get an overview of it in the data connection window:
Thanks. Great to hear that you are developping something like this. It would be much more intuitive especially when you deal a lot of tables and building a star schema.
I'm also an experienced Power BI user that is currently in the Tableau world. Not having the data model visualization is a challenging drawback. Hope to see Tableau develop something similar soon.