It is true though that if you look at the areas that appear to be the most lacking in these FO4 shots (e.g. draw and shadow distance) then those are the graphical features which generally do come with a significant CPU cost.The former set is primarily CPU bound. The latter is primarily GPU bound.
Purely GPU-only features such as resolution seem to be less of an issue.
Of course, the lacking AO doesn't fit with this argument, since it's also a really GPU-bound feature. It's also the most puzzling omission to me.