I noticed that too. I'm not sure of the benefit of PWA on desktop, but I built a progressive web app, mainly because I need very few native features (currently only using push notifications) and I'm only one person so I don't have time/interest in writing native code when I can write for the web and be done.

I use it daily on my Android and it works well for my needs. I get caching and push notifications, my app is right on my home screen so just one click away. All this is very cheap (writing a service worker) compared to trying to figure out Cordova or Electron.