If a mobile client like Amethyst or Damus added a web browser, not only could it sign events for Nostr web apps, you could zap websites, podcasts, videos, etc with enabled v4v tags like you can on desktop with Alby.

You could use nostr or lightning login on sites that enable it.

Kiwi with Alby and Nos2x gets close, I'm really enjoying that flexibility. But it's still a bit complicated for most people to get figured out. What I LOVE about Kiwi is being able to switch on dark mode for ALL WEBSITES.