My opinionated nonsense was based on the considerable AoA used for takeoff and landing at (light) flight test weights which to my way of thinking would have required a lot of runway to be available at operational weights.
So, opinionated - sure. Nonsense - not sure.
As to the original low level high speed penetrator operational requirement, with the full benefit of hindsight the viability/usefulness of such a role would probably be fairly low today.