For example the release notes mentions a new JS UI framework at the OS level with the potential to replace Android Java completely.
Had Google or Apple done this it would be sitting pretty on the hn front page for days.
Here it is just ignored in the politics of Huawei.
https://news.ycombinator.com/item?id=27378926
Which has some example code - as I understand it the apps will look just like android apps.
There are just far more JavaScript developers out there than android Java/kotlin developers.
Also if you just distribute the js, the apps would get quite small, so maybe you no longer need an App Store with an explicit installation step but instead you could just browse the apps on the internet like you would browse web pages.