I expect that that most HN users probably have a flagship mobile phone with lots of CPU, RAM and reliable mobile data options. The other 90% of the world can not say that and a lot more sensitive to apps that require advanced phones and operating environments to function.

It's natural to see students using easier stuff as well. Most of student projects you come across is using react, flutter, firebase, MongoDB, as opposed to Angular/Vue, Android native/Jetpack, postgresql etc.. which have much higher barrier to entry.

But this may have to do with developing countries having more recent developers, and less established developers.