PWA's are freaking awesome for both users and developers. Users don't have to install a massive app and me as a developer can focus on making one platform better rather than 3.
And they are pretty freaking powerful in what you can do. Not to toot my own horn too much but I created an "app"[1] for viewing cities on the other side of the earth from where you're standing. It's got camera, gyro and GPS to determine what you're looking at to the folks I've shown it too, anyone non-technical has been completely fooled and thought it was a proper app.