Entities are, very broadly speaking, only useful for games. ECS is a type of composition programming and, I agree, it certainly seems to be a better approach.

Entities are, very broadly speaking, only useful for games. ECS is a type of composition programming and, I agree, it certainly seems to be a better approach. Rust traits are essentially static composition, and Rust seems to be eating the programming world. I cannot fathom what a language with dynamic/late-bound/ECS composition would even look like. Hopefully we get to see some interesting stuff in that space.