cognitive psychology. PhD 
ECS is really interesting as a system architecture. But it's very much still in the "React in 2012 without contexts or hooks" phase -- lots of boilerplate and passing data around, at least in Rust/Bevy.
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The benefit of traits vs. classes is that I can add *functions* to existing objects without needing to modify a monolithic definition. The benefit of ECS vs. structs is that I can add *data* to existing objects without needing to modify a monolithic definition.
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(I realized ECS is not very googleable -- it stands for "entity-component-system".)
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CBOO vs functional strikes again
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I feel like ECS is a hacky workaround for a language’s lack of extensible records in the same way the “visitor pattern” is a hacky workaround for a language’s lack of algebraic data types and pattern matching. Or is there something else there?
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I’ve never seen a language with extensible records, so can’t say 100%. I searched and found Elm, but it just lets you define type aliases. You would need structural subtyping to make that work as traits do. Are you thinking of a specific lang?
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"You can have it all: abstraction and good cache performance" was an interesting paper relevant to this, attempting to abstract over SoA vs AoS styles of programming: https://www.doc.ic.ac.uk/~scd/ShapesOnwards.pdf …
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