I thought that the point of Tableau was to provide a tool that end-users (who can't program) could use to interactively explore their data. That's not something you can replicate with a bunch of scripts.
I can see how Tableau would be great if you are in a situation where you can have business guys creating their dashboards and exploring their data.
The issue in practice is almost always getting the data in a workable state so that you can manipulate it easily in Tableau. In my experience in smaller and mid-sized places, Tableau tasks get punted to analytics and data science, because they are needed anyway to get and transform the data in the first place. And these people usually prefer and are capable of using more technical tools than Tableau. I know I would rather use Shiny or Dash.
Maybe that's not a difficult problem in larger corps.
I thought that the point of Tableau was to provide a tool that end-users (who can't program) could use to interactively explore their data. That's not something you can replicate with a bunch of scripts.