I think your argument focuses a lot on the scenario where you already have cleaned data (i.e., data warehouse). I and many other data engineers agree, you're better off with hosting it on SQL RDBMS.

However, before that, you need a lot of code to clean the data and raw data does not fit well into a structured RDBMS. Here you choose to either map your raw data into row view or a table view. You're now left with the choice of either inventing your own domain object (row view) or use a dataframe (table view).