It looks to me like "WordPress for iOS" is actually "WordPress.com for iOS" these days. If you run a self-hosted WordPress site without Jetpack on it then the first two tabs at the bottom serve no function.

The new UI looks a whole lot less like WordPress (as you noted with the removal of the sidebar) and a whole lot more like WordPress.com.

Is this a problem? I'm not sure. But at what point do we realise that this WordPress app is actually being used primarily to push WordPress.com?