It seems close to pointless, but a dedicated window per PWA pinned to your taskbar/start menu is handy. It also doesn't get clustered together with other browser windows which I like. And the icon is visually different. If you don't want the feature then you just don't install the "app" (strong word for it). I like it for a couple of things (JIRA, email) but not others (social media). I wish they hadn't removed the feature and I'm probably going to switch browsers because of it although I'm loathe to do so.

With the potential for contextual menu, and some stored local data, mhmm.

It's really a UX thing.

So glad it's getting more attention.