And yet business people don't get any tests. No one else on the entire planet gets tests for almost every role opportunity they want to explore. So why do developers have to?
Actually, I can answer that. The answer is because the overwhelming majority of a modern company's productivity is up to the performance of the developers. The business guys get away with under-performing because their underprformance is not a significant factor on the bottom line.
The commonplace testing of developers has nothing to do with ratios of good to bad developers, or the relative ease of assessing developer skill compared to other professions. It has everything to do with the fact that developers drive the lions share of modern business value so they've been singled out for shitty treatment with testing and kaggle competitions and similar garbage. I really hope to see a software engineering union rise in the next few years which cracks down on this and empowers developers to negotiate relative to their actual value in modern business.
People like you aren't needed in the world of high tech. Your role is redundant.