I came across this today:

https://www.stephenwolfram.com/publications/academic/all/

"Note: Since 1987, Stephen Wolfram’s intellectual efforts have not primarily been reported in academic articles."

To be clear - no serious scientist believes that a scholarly output which is composed predominantly of non-peer reviewed publications is a serious or valid output.

Essentially, Wolfram is a glorified blogger who runs a tech company. That's not nothing, but it doesn't make someone a scientific leader.