Hacker News has mostly discussed JavaScript and TypeScript over the past 15 years. These languages do seem to have some long-term succes.
JavaScript has success because it has a monopoly in the browser, anything you want to do there has to go through JavaScript, not because of any merit of the language.
I don't think so. Things built in those languages may have been discussed on HN, but the amount of discussion about those languages has not been proportional at all to their popularity.
In this context I interpret unfashionable as boring/normal/works/good enough/predictable etc.
Kind of, in .NET you also have structured concurrency and dataflow, which are another way without having to explicitly write async/await.
Yes, sadly Java and .NET are unfashionable in circles like HN, and recent SaaS startups, I keep seeing products that only offer nodejs based SDKs, when they offer Java/.NET SDKs they are generaly always outdated verus the nodejs one.
First, that would be Java and Go, not Java and .NET, as .NET offers a separate construct (async/await) for high-throughput concurrency.
Second, while "unfashionable" in some sense, I guess, it's no wonder that Java is many times popular than any "fashionable" language. Also, if "fashionable" means "much discussed on HN", then that has historically been a terrible predictor of language success. There's almost an inverse correlation between how much a language is discussed on HN and its long-term success, and that's not surprising, as it's the less commonplace things that are more interesting to talk about. HN is more Vogue magazine than the New York Times.