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The top level retries weren't enough, probably because we do so many network requests. Fine grained retries ensure that there is higher potential for the entire test to succeed. To demonstrate this, consider the following example: let's assume that each request has 5% chance of failing and we do 10 requests. Then chances of success without any retries is 0.95^10 = 0.6. With 3 top level retries it is 1-0.4^3 = 0.936. With 3 fine grained retries it is (1-0.05^3)^10 = 0.9988 (roundings implicit). So chances of failure are 6.4% for the top level retry vs 0.12% for the fine grained retry. Follow-up of #6155