I was part of the project that moved Nintendo’s inventory management system from as/400 to SAP HANA in 2015.

We had massive queries that ran in seconds that HANA with millions blown into the consultants just couldn’t complete in time (nightly billing runs).

The solution in the end was that a lot of complexity and decades of cleverness in adjusting to specific patterns in customer behavior were thrown out and replaced by “the consultant will just adjust that every week by hand”.

Also - I was soooo much faster with a num pad and the terminal than clicking around the SAP GUI. Ultimately part of why I left there.