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I agree with you. On all counts. I also don't find my own distinction very useful, and I also agree that part of it is "level in the stack" related problems.

The attribution for me had a lot more to do with the balance of optimism and skepticism. In my head the "developer" sees HDFS and goes, "Sweet, somebody solved this problem, now let me go use that thing and it will give me all these wonderful solved-problem qualities I don't have to think about anymore. This is going to save me a ton of time." The "engineer" looks at HDFS and goes, "Hmmm. This thing seems interesting, but this feature over here must be an incredibly painful one to use despite the fact that it seems super useful and is plastered all over their docs as being awesome. Because there's no free lunch in this problem space. So what possible methods are there to have implemented this kind of thing and how exactly can I test and exploit just how weak these floorboards are before I decide to start building on it?"

Again, not a very useful distinction. Agreed.

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