jaror

The machine itself can generally only do very simple things

I disagree. Assembly languages for modern architectures are a complexity hell. You need books with thousands of pages to explain how they work. In comparison the lambda calculus is much simpler.

The symbolic rewriting is interesting.

I do wonder what “modern-style” functional programming means.

Also their FAQ says:

But considering other FPLs like Haskell and ML, Pure’s library support isn’t bad

Clicking that link reveals a list of about 34 libraries. In comparison, Haskell’s current curated Stackage snapshot has 3340 packages in it (the total number of packages is probably more than 10x that). So, I think it is odd to claim its ecosystem is anywhere near Haskell’s.