While I believe you could use all of these technologies when they have been abstracted away into APIs / programming languages etc, I have a hard time believing

While I believe you could use all of these technologies when they have been abstracted away into APIs / programming languages etc, I have a hard time believing anybody could understand these technologies to the point of creating abstractions which is what is meant when one says they 'develop in assembly': you expect them to know stuff that, C, for example, abstracts away.