The change: PWAs installed to the home screen will no longer open as individual apps, but as web apps in the browser.
Most web apps are already only used in the browser, so almost all web apps will continue to work the same as before.
What will break: functionality conditional upon installing to the home screen. The big one is push notifications.
What won’t break: almost every web app will continue to work the same as before. Everything that currently works when opened in Safari will continue to work like that.
Open Web Advocacy really really want people to equate the functionality specific to PWAs installed to the home screen with all web apps. This is not true.
It’s perfectly fine to be angry with Apple for this change. It’s perfectly fine to demand change. What is not fine is telling outright lies like “Apple will break all web apps”. This is not even remotely close to being true and they know this. It’s an intentional lie to get people angry.