Closing a switch has been determined to be equivalent to starting a fire. Some workarounds use magnetic switches which are acceptable to some.
I agree that all historical attempts to associate electricity with particular melachot were not based on a full scientific understanding. Pinning the "fire" label on incandescent bulbs didn't really address the fundamental issue for all other appliances. As you mentioned, Rav SZ Auerbach would likely not have associated smartphone or laptop usage with uvdin d'chol.
However, I'm eminently thankful that the standard Orthdox practice has evolved to prohibit electrical appliance usage. I can see what Shabbat would have become otherwise, based on what Tisha B'Av is like. On Tisha B'Av, I make an effort to get into the spirit of the day, which means that I use my laptop for listening to (or watching) kinot and reading appropriate material. In the afternoon, when I'm worn out, I'll just "peek over" bat email -- and by then, the Tisha B'Av effect is shot.
If laptop usage were not forbidden, Shabbat would sadly become almost like every other day (at least for me).
On the flip side, I have enormous sympathy for the youth who keep "half Shabbat", i.e. they don't perform any major melachot, but they will use their smartphones. For many of them, social networks are an essential element of their daily life.
You can find accurate information at the Zomet institute https://www.zomet.org.il/eng/
It's not really right for Hacker News to debate Jewish Law during the shabbos in the U.S. when Jews aren't around.
Why not? It's true that religious topics have the potential for flame wars, and often don't match the goals of HN. Outside of HN, it's important for religion and culture not to be exempt from rational inquiry, both by insiders and outsiders. If religious or deep cultural discussion were only permissible when a devotee is present, then demonstrably problematic religions or cultures would have an unfair and biased insulating shield to maintain their problems under the guise of false decency.
But specifically in this case where a very prominent culture intersects with technology in a very unique way, why can't it be discussed from a technological and anthropological perspective, regardless of who is around, and whether they are either not a member of this culture, or they are violating their local time's sabbath by doing so?