One answer would be 'science is done in a much more collaborative way now' so singular titans of a field is much less of a thing. That being said, I suspect an

One answer would be 'science is done in a much more collaborative way now' so singular titans of a field is much less of a thing. That being said, I suspect another answer would be 'Imagine some kind of complex disaster investigation, who would the nation call on to help solve it?' That he was brilliant and also seemingly very broad, is probably less common now along both axis simply because there's so much more stuff now in every field.