Incomplete Integration of PowerApps as a SharePoint Custom Form

I have created a custom form using PowerApps in a SharePoint List. In the desktop browser you can view, add and edit using the new form fine. 

A have come across 2 issues that I would describe as incomplete integration. 

1/ If you create a flow that sends an email with a link to the item, that item will not open using the custom form. 

2/ If you using SharePoint Mobile App and open a list with a custom form, it does not open using the custom form. 

We need Microsoft to full integrate custom forms in all scenarios, especially mobile access and with Flow workflows in order to be viable and less confusing to users.