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@lynx
Thank you, there is so much I have forgotten.
Not sure the relevance to this thread, but this is just where my thinking is heading. That the bearings on the head tube act as one so both bearings act as one. But with the bottom more prone to the lubricant not being in the right place so bottom is quicker to fail than the top.
On motor bikes, the usual head bearings are non sealed flat bearings and usually the bottom fails due to not being regreased regularly (lube not in the right place)while the top bearing usually fails due to over tightening. The usual replacement is taper bearings to elongate life.