[43920]

> As long as Safari remains the default or very popular, sites will probably have to support it anyway regardless of if other browser engines are available.

But if another engine supports additional features that Safari doesn't, you could still offer those features to users of other browsers, i.e. you could do something like "install Chrome/Firefox to use our PWA".

> Would battery life, performance etc be prioritized as highly on iOS as their own platform?

Maybe not, but in that case people could switch back to Safari or another competitor like Firefox.