Even though the spec is finalized there are enough variation on support on different browsers leading to substantial efforts to make a web components based pwa

Even though the spec is finalized there are enough variation on support on different browsers leading to substantial efforts to make a web components based pwa work on multu-browser. If it had been worked out properly there's isn't any need of react or angular except for a state management library, since the views and components is taken care of by the browser directly.