With the upcoming MacOS Sonoma, Apple will allow to have Progressive Web Apps and normal websites to appear in the Dock and to be integrated into the operating system. Apple says
Use any website like an app. I´m looking forward to it.
The out-of-the box launch experience of web apps is fantastic. Nowhere does it give away that this is a web app. For apps with a manifest, there’s no Safari UI whatsoever, and the expectation is that such apps are single-page apps that provide their own navigation controls. If an app is well made, lay persons probably wouldn’t be able to tell that something is a web app.
Web apps in macOS Sonoma 14 Beta seamlessly integrate into the macOS experience, with no or very little visible Safari UI and with support for various operating system features.