I don't know -- this write-up and visualization completely aligns with my experience building mobile web apps.

Over the past few years, I have been for real disappointed that Safari did not support: Vibration API, Push API, ResizeObserver, AudioWorklets, and on and on.

And then the product people say, quite reasonably, "Well, I guess we'll just need to build a native iOS app and pay the 'Apple tax'". Over which I don't think Apple are shedding many tears...