Like of course, each domain has its own set of primitives and operations that make sense for it, and we need libraries/languages/whatever to reflect that. The main question is rather, when there is shared structure between domains, how much of that can be captured by abstractions in the underlying programming system?

@Will I'm not sure I understand exactly what you mean. Could you give: 1. an example of what you mean by shared structure between domains; 2. an example of it being captured by abstractions in the underlying programming system; 3. an example of it not being captured by abstractions in the underlying system?

1. Many operations in different domains can be meaningfully modeled as higher order functions. Map and filter in the data/list processing domain, route handling in the web processing domain. A language which allows higher-order functions can enable both domains to express that underlying structure in their API.

Thanks, that's very clear.