Sincerely, what's confusing about it? There is a massive monetary incentive toward native. I don't think it's any kind of top-down nefarious decision, but is probably an emergent quality based on priority.
I worked with a group of engineers full time for years around mobile/iOS, and we were pretty amazed at how severe but unaddressed these bugs were. The move to WKWebView was helpful, but still lacking. The app store parallel that you take issue with is an easy one to make when you contrast those failings against the talent and financial bandwidth of a company that size.
