Nice!
I would like one important feature for PowerApps usability: Persistent Tabs.
Currently, a PowerApps tab does not retain its contents - as soon as you navigate elsewhere, its contents are destroyed. In other words, it is not persistent.
It is very common to have to consult information elsewhere before continuing to work on some content.
In the current model, having to consult elsewhere in the hub, then going back to a pinned PowerApps Tab, means reloading it from scratch, which takes time and bandwidth.
If the PowerApps Tab was persistent, it would maintain its state, just like a web browser tab. The user would be able to go elsewhere to consult information, then come back to the PowerApps Tab, and keep working merrily.
It will likely need a reload button for the user to force a refresh, like reloading a browser page, and the "Persistent" toggle would be changeable after pinning the tab.
Please make "Persistent Tabs" for PowerApps a reality!