TL;DR: Sir Tim Berners-Lee, inventor of the World Wide Web and HTML, has expressed support for compelling Apple to allow other browser engines on iOS, as more competition leads to more innovation and bright ideas. He also states that having a powerful browser on iOS would “change the dynamic” with respect to web app’s viability on mobile.**

I don’t really care if there’s only one browser engine — but that engine had better support the latest international standards around stuff like progressive web apps.

Apple still supports PWAs, but they’ve become second class citizens. It should be possible to deploy most software as a PWA from XCode instead of a dedicated binary, including with access to hardware interfaces. And it would still be secure, and wouldn’t require app stores or sideloading.