This is why.
Yes, Farmerman is, indeed, an expert in his field (His geo-insight is accurate and rare).
It's when he wanders from his field, he gets bitchy - Because his 'specialist'-'field' is detrimental to his 'broad-spectrum-field'.
Is this why you suspended me from a2k, again, this week, Tom?
And, Yes, geophysics is valuable!
But don't let rockboy know - He may think his geo-knowledge guarantees credibility in other subjects