[papln]

What's the problem with this? redialing essentially converts the FIFO/LIFO queue to a random queue, which isn't particularly worse.

Ultimately, the utility of "lower 50%ile" vs "lower 99.9%ile" is a subjective choice.

The value in LIFO is the observation that real people would rather their 10-minute request fail and require a retry due to LIFO (since they are already disatisfied with the original service*) than their 1second request take 1 minute due to FIFO.

[_v7gu]

People feel cheated when you request them to wait, but they can get better outcomes by redialing. It violates the trust between the call center and the dialer. Leaving people to wait forever is a bad, bad, bad move.

Alternative scenario: Someone figures out the best way of dealing with LIFO is spamming requests until one gets through and you end up with several multitudes of queuing work.