[Syzygies]

Yes. Chez Scheme in particular is a remarkable implementation. Idris 2 for example (a leaner, dependently typed relative of Haskell) relies on Chez Scheme.

As a mathematician I don't need a large ecosystem of other people's work. What keeps drawing me back to Haskell is the experience of reasoning about code paradigms as if they are a branch of algebra (not everyone appreciates algebra, but those who do can never turn around), and a support for parallel code that is decades ahead of any other language I have tried.