Thanks.
With the first one, I started framing a little to the right after taking this shot. Made a bid difference, and not a good one

The extra DR comes in handy when there are areas that may be a little to close to black, and you want to lift the shadows in post to really see the detail. If you're good with fill light in a studio, this probably doesn't matter, as you say. If you're lights are strong enough, to use below ISO 100, then you gain the benefit of increased SNR through the entire exposure.