Facebook's HTML5 app was 5 years ago, this example comes every time but it's outdated. technologies like Electron or React Native didn't even exist at the time.
5 years is huge when it comes to web technologies.
5 years is huge when it comes to web technologies.
I think the issue is time and resources. Small teams, like Slack, would like to create a slick experience but they don't have the time.
Companies like Facebook went the other route -- HTML5 on mobile, got their fingers burnt, and went all-in on native. StackOverflow's iOS app appears to have improved a lot too, in v1 it was a thin shell around the web interface.
I hope React Native catches on. I'm not a huge fan of how 'heavy' Electron is myself.