I am not the subject matter expert but have spent first few year of my career doing data warehousing. I think OLAP cubes are falling out of fashion because traditional BI and reporting in general is falling out of fashion.
With self-service BI tools like looker and other tools, Business folks are running more adhoc queries than traditionally piped data through ETL processes.
With self-service BI tools like looker and other tools, Business folks are running more adhoc queries than traditionally piped data through ETL processes.