I think this is still applicable advice for embedded DSLs too, since the grammar of the DSL will be made up of the ways in which you can compose the operations

I think this is still applicable advice for embedded DSLs too, since the grammar of the DSL will be made up of the ways in which you can compose the operations you provide, whether they are parsed by the host language's parser or your own. Overall, I agree that it's important to think about how to make sure that operations compose in an unintuitive, expected way. I find this hard to figure out without thinking of it in terms of a grammar and semantics, whether it's embedded or not.