They are referring to companies like GitHub [1] and Slack [2].

[1] https://githubengineering.com/how-four-native-developers-wro...

[2] https://slack.engineering/growing-pains-migrating-slacks-des...

There's no native Facebook messenger for desktop, either.

At least you can use messenger.com in a browser and get a decent experience _with your existing browser_.

Good enough for me personally.