What do you mean? I can have an app that i use a lot in its separate window accessible by cmd+tab, without unnecessary toolbars on top, it's not hidden among tens of other browser tabs and windows i have open. Works offline. That seems quite useful to me.
For the first time ever, it is possible to build an app that runs on anything that can run webkit.
I use the same app on iOS, Android, Windows, MacOS, Debian, even GrapheneOS. No AppStore, no account needed.
I think it benefits or at least could benefit the end user a lot in the long term, but it hurts the walled/semiwalled gardens of MS, Apple and Google and their business. Which is why they seem so reluctant to support it better.
How Firefox does not see this potential app freedom is beyond me.