All this talk about passion by great successes might be considered using this analogy:

A successful mountain climber speaking of his achievements at scaling peaks, would passionately focus on the views from the tops, the spiritual experience of fulfilment and calm and being one with nature, and all that.
He or she could of course explain the use of oxygen tanks, the perils of altitude sickness and deep crevasses, blah blah etc., but that's likely not most desired.

So yes, passion can be overrated, but it remains the overview.
Without it, wonder how much more the money's worth earning.