Maybe it's a kind of having your cake and eating it too: enjoying the flexibility of passing code around and running it with eval, while not having the security

Maybe it's a kind of having your cake and eating it too: enjoying the flexibility of passing code around and running it with eval, while not having the security, stability and runtime problems implied by eval. There are limited scopes in which this can work but it seems to be more about the environment or code loader than about the programming language, per se: for example, plugin systems for build tools and servers. The plugin might be isolated by runtime features (like in the JVM) or by processes (as some web servers do, or as Postgres does) but it's not language features that tend to be useful. Tensorflow models and CSS selectors are both examples of fairly useful plugins that still have limited enough semantics to be sandboxed effectively.