It makes me think of the first iMacs having clear backs so you could see inside and see how complicated but tidy it was inside. Contrast that with a modern iMac where you'd have a hard time even opening it.
I think most people on HN belong to a segment of the population that wants to know how things work, that is always asking questions, that grew up taking things apart to see inside. As much as I wish it was different, most people are not like us. They want things to just work, they ask for the elevator pitch, they want the milk not the cow.
If you're making something for the HN crowd, then by all means give them a peek behind the curtain. But if you're selling mass market, keep it simple and abstract away all the "messy" details.
Anyway, I really like Scott Berkun's post on the matter: http://scottberkun.com/2013/the-no-ui-debate-is-rubbish/
As a software guy, I'm always a little in awe of HVAC, which I don't know very well. It's cool to stop and think about the complex flow chart of materials and skills involved in making something like this. Think of just one of those pipes, and all the engineering that goes into them. You have to make steel with the right properties for pressurized water or steam. You have to to cut and drill the steel to precise tolerances. You need a way to move them into place (they're very heavy). You may or may not have to weld them once they're in place. So on and so on.
Pictures like these are a nice reminder of the true depth and breadth of our technology stack. It doesn't bottom out at the CPU. And it's amazing that no one person understands the whole stack, but it all works in concert.
* No leaks
* No rust
* Flow directions identified
* Flow content/category/origin/destination identified by color
* Room to move replacement parts in and inoperative ones out
* Equipment pads for... I don't know, but it looks good
* Engineering, not haphazard patching
* No people
Two obvious examples are the "desktop" and the "slideshow." One is based on the metaphor of a physical desktop. The other is based on a slide projector. You can put a "file" in the "trash" and know that you're getting rid of it, for instance, without knowing anything about the machine's filesystem.
The problem is when the purpose and power of a technology are at odds with the original metaphor on which it's based. For example, comparing presentation software to a slide projector helped people understand how to use it, but do humans really think in terms of slides? Before PowerPoint, a lot of great orators moved fluidly through their presentations, pacing through the audience and engaging the crowd.
I think that many people embrace and stick with metaphors because they're comfortable, even when they're not necessarily the most efficient or useful. Maybe we could deliver more effective presentations by not fragmenting our ideas into slides. Maybe we could treat our data more responsibly by not believing that it exists in a cushy, omnipotent cloud.
Additionally the argument that "no interface" means you won't be able to troubleshoot something is an overly literal interpretation of the age old concept. As though "no interface" is not just a design ideal, which may not always be possible, but rather a movement to force round pegs into square holes. A more forward thinking point of view would be what innovation can be made in these areas, vs. looking backwards at how things used to work.