If the higher-priority ones are already marked with asterisks or something, then you don't have to read the whole list every time to find the one most important one.
I would suggest there's a difference between marking high priority items with asterisks, and adding ABC 123 priorities next to each item. Items that are high enough priority to require an asterisk usually remain high priority until done. But if you've rated priority in relation to each other (ABC/123), that prioritization will need updating constantly as things change.
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