I wish you were right. But for a reasonably simple (in my mind) weather UI, constructing the native Widgets on a cold start takes long enough that you get warnings for too much activity on the UI thread. But you can't build Widgets off the UI thread to get parallelism like you would do for other things that are slow, because Widgets have to be built on the UI thread if you want to show them.

A similar HTML layout shows up a ton faster in Chrome or a webview.