Mobile native app programming.
I vehemently hate installing apps on my phone that have no business being an native app when they could have just build a responsive web app, and too many apps in the marketplace are like that, and most Android apps are pretty shitty and potentially insecure (at least back in the days).
Web APIs are getting more and more powerful, browsers have gotten a lot more performant, and there's a lot of modern techniques to make very high performance web applications, I think web apps is the future.
In general though, I still try to learn the core concepts of each technology to figure out what's the appropriate application of them. Along that lines, IMHO there's very few places where there's a real need for blockchain.
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