Well, he does have a point. There certainly is value in having right seat time in a high performance aircraft, but I would MUCH rather fly with somebody who has spent a considerable amount of time as a PIC in some capacity over a pilot that has spent most of their career as an SIC. For those that have spent most of their time in the right seat, you're simply not going to understand.

When you're sitting in the left seat and making the decisions, it's a completely different mentality than being an SIC. It doesn't matter if you're flying a Navajo or some kind of turbojet, as PIC you are sometimes making some very tough decisions that an SIC isn't burdened with. Unless you've spent considerable time in both positions, you probably won't understand.