I think PowerBI compares with Tableau quite favorably. For the most part PowerBI is a clone of Tableau, but it goes farther and adds in much more powerful scripting(M, Python, R), a library of custom visuals, Power Query which is a nice GUI for data transformation, and deep formula language (DAX). I think it's easy for an Excel or Tableau user to pick up in a day, but it scales much more as you have more data analysis expertise.
Also MS has been improving it like crazy over the past few years. They clearly want to maintain their dominance in the data analysis space, but see the winds shifting away from Excel and are not waiting to become irrelevant.
The model isn't that a business user would use Python or R. Rather, a data scientist shares live-computed analytics to business users through a report / dashboard.
Microsoft has PowerBI which is already almost magic for many business users with it's ease of connectability with different databases and SaaS services. Transformations, parsing, mixing data from different sources and reporting capabilities are also easy to start with and quite powerful in the right hands. It's not integrated into Excel directly but sits quite well imho in the MS ecosystem.
PowerBI wants to be Tableau based on the number of times Microsoft sales has demoed and whatnot.
But I haven’t met databiz people who switched from tableau to PBI. I’m not sure why as they look pretty similar on paper.
I think Tableau’s mental model is about exporting and storytelling while PBI is about reporting.
Personally, I find it harder to work with PBI because it’s the only license model more confusing that Tableau. And there’s no Tableau Public equivalent.
This - we had power pivot in excel - then for some licensing reasons we didn’t. I know how to buy excel and firms buy it blindly - tie power bi into that sales channel