And the throughput in AAABBBCCC is 1 project in 3 days, where ABCABCACB has a throughput of 0 projects in 3 days. In a business where cashflow is important, that 3 day throughput is more important than the overall 9-day throughput.
That's a good point, if you're taking into account cash flow and exponential return on cash flow, then having projects finish sooner and start generating cash flow and interest sooner is preferred. Fewer context switches also contributes to that.
And the throughput in AAABBBCCC is 1 project in 3 days, where ABCABCACB has a throughput of 0 projects in 3 days. In a business where cashflow is important, that 3 day throughput is more important than the overall 9-day throughput.