I was out on a drive here in New England with several other 356's when one of them suddenly developed a fouled plug. "It's OK!", said the driver, "I always carry a spare!"
He pulled the plug out of his spares in the frunk and someone asked for the plug wrench.
"Oo.... I don't have one of those!"
So to your question, Mark..... It's probably more of a "I can do this, so I will!" thing.