[sulam]

Have you used the Kindle app?

You can do title search, look at details of books, see reviews, download sample chapters, and download Kindle Unlimited books directly to your library with one click.

I presume what you _can_ and _can't_ do is directly dictated by Apple's policies, not what the Kindle team has been able to implement. As others have pointed out, native apps are a far superior user experience to HTML "apps".