Sorry, OLAP and ETL are real problems that need to be solved, SSAS and SSIS were (and still are in many cases) as good as the next tool for solving them, especi

Sorry, OLAP and ETL are real problems that need to be solved, SSAS and SSIS were (and still are in many cases) as good as the next tool for solving them, especially with their enterprise features like security and auditing/logging, which are almost always nonexistent in opensource / homegrown solutions. Tools like Airflow and Druid are just now getting to where those tools were in 2005 ... unfortunately those tools haven't done much since about 2015 when Azure became the new hotness.