So lets use an analogy
You are doing a WOF
you give the head bearing a yank and cheek for notchiness yes.
After satisfying yourself they are in decent condition you move on.
But what you are suggesting is that even if they pass the test.
You should then remove the forks disassemble the steering head
Degrease the bearing look at then under an Electron microscope for possible pitting and micro-abrasion.
Measure each ball/roller with a Micrometer.
Then send samples away to check to see the depth of hardness on the race and rollers/balls
Do a check on the bearing numbers in a FBI fraud database to check if they are not cheap knock offs.
ETC etc etc........
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