Slightly related to this, this article made me check Simon Peyton Jones's wiki page [1], where I saw this:
> Jones has played a vital role in the development of new Microsoft Excel features since 2003, when he published a paper on user-defined functions.[19] In 2021, anonymous functions and let expressions were made available in the Office 365 version of Excel as a beta feature.[20]
Truly, there were (possibly still are) a lot of smart people working on Excel, as the years go by I'm starting to think of it as one of the most interesting pieces of software ever written.