[brap]

Did you read the post or just the title? It doesn't say that applications are functions.

[mpweiher]

TFA:

Fundamentally an application can be written to have at it’s core, a single, stateless pure function, behold!

[brap]

Yes, "at its core" being the center of the post. Are you ready to read it now?

[mpweiher]

You might want to read up on the concept of Architectural Mismatch.

https://repository.upenn.edu/library_papers/68/

https://rd.springer.com/content/pdf/10.1007/978-3-540-92698-...