The Chamberlain MyQ app for Android does exactly that. Just download it from the app store and link it to your MyQ hub. I just tried the one on my Android phone and it works just fine. I don't have a Google Home Assistant so I can't address that issue.
Not the same. A widget coexists on a screen with other icons and widgets. Makes a huge difference in functionality to not have to open that app all the time. Particularly with a smart home, you can then have it on the same home screen as, say, your Hue lighting control widgets