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Had an FO, 10,000+ hrs, get all excited about the hold short line passing below our LINE OF SIGHT. Not that we were going to cross it, but that it was disappearing from our forward field of view. GMAFB. We can't see for about 50' in front of the a/c. So his standard would have us hold 50' short of every line? '
Let me understand you correctly.
I think you are saying you passed the hold short line while taxiing as it went below your line of sight.
Don't know what type you are operating but most transport Aircraft Cockpits project a fair distance ahead of the nosewheel so you are past the hold line.
Or do you think, like some that if the nosewheel is short of the line then you are ?!