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.