[jimbokun]

I sense a similar thing happening with languages stealing functional features from Haskell, similarly to how languages stole OO features from Smalltalk.

C++, Java, Objective C, Ruby borrowed OO ideas from Smalltalk to varying degrees. Eventually, you could get most of the benefit of Smalltalk OO ideas without actually using Smalltalk.

Swift, Rust, Scala borrow functional programming ideas from Haskell (and ML) to varying degrees. My hunch is many programmers will encounter and use functional programming constructs in those languages, without ever programming in Haskell.

To complete the comparison, Smalltalk is still arguably OO in its purest form, as Haskell is probably the purest embodiment of the functional programming paradigm. But in both cases, most programmers are happy to adopt some subset of those features in languages more similar to the onese they already know.