See my question above for an answer on why they are not more prevalent. If you break ties based on FIFO, you've just created a clunky FIFO match, which is used

See my question above for an answer on why they are not more prevalent. If you break ties based on FIFO, you've just created a clunky FIFO match, which is used everywhere. If you break ties randomly, you've just created a clunky pro-rata match, which is used everywhere.