These tests and questions are often in place so people feel they can manage the risk/uncertainty of hiring. Some studies show that previous performance is the key indicator of future performance. Interviewing and testing in the hiring process are negligible at best.
The contrast in the speed and level of disruption between SE (120 workers) and the DE (workforce of 11,000) is super interesting. Power of public policy, compliance and network effect wrapped up in an IRL use case.