I used to think that I hated excel, and that as a DataScientist-TradingDeskAnalyst, python or R would save the world. Now I realize that my hatred for Excel has nothing to do with the software itself, but the way it is used for political motives. If your VP or Top Trader or Boss choose to keep everying on 'his' excel, its not for sofwtare quality. Its for control. You can run away with your excel-data-model on a USB stick. Not so true for SaaS. You can keep it on your PC, and not share it with others. You can put passwords without IT knowing about it. Excel = Shadow IT department with hidden political goals.