Although Apple now has to allow alternative browsers to ship their engines in the EU, they actually set out ridiculous conditions for browser vendors to be able to do so. Therefore, as of now, none have done it.
This is malicious compliance from Apple to try and make the law ineffective.
It'll get done sooner than later, that's money just left on the table right now for EU browser makers. And the enforcement of the DMA correcting Apple's most obvious malicious compliance has been swift (backtracking on EU PWAs).
Although Apple now has to allow alternative browsers to ship their engines in the EU, they actually set out ridiculous conditions for browser vendors to be able to do so. Therefore, as of now, none have done it.
This is malicious compliance from Apple to try and make the law ineffective.
Does enforcing a single rendering engine make things like Progressive Web Apps (PWAs) possible?
(It's not just a link to a web app on the homepage, it can also hold state, receive notifications, and (within reason) take over most of the screen.)
https://web.dev/explore/progressive-web-apps
Enforcing a single browser engine is in no way a requirement for PWAs, no.
Windows, macOS and Android all support PWAs while also allowing them to be run by different browser engines.
It'll get done sooner than later, that's money just left on the table right now for EU browser makers. And the enforcement of the DMA correcting Apple's most obvious malicious compliance has been swift (backtracking on EU PWAs).