An industrial simulation, in my context, is modeling the stateful flow of things through industrial processes. It typically involves millions of instances of thousands of types. There are typically much fewer very well defined processes, most of which would be trivial to implement with a simple impl trait with default methods. But some require stateful members in order to implement a default behavior, but Rust traits do not have fields/members, just functions.

Rust traits and Scala traits (or abstract classes) are more or less equivalent with this one exception. I was just pointed to a proposal that would allow for this in Rust, but it is not yet implemented [0]. Essentially, you would be able to define type members, and then "link" them to a member of the struct/enum that is being "impl"-ed. While ergonomically not quite the same as scala, it is effectively the same as inheriting an abstract class with a constructor parameter.

[0] https://github.com/rust-lang/rfcs/pull/1546