Sometimes the other way around.
Can i submit my info through the app and still decide to use GE?
Yes why do you think not?
Disagree, you still have to wait online with mobile passport, almost never any lines for GE.
That reminds me when I landed in JFK I went to the GE/mobile passport line which were all the same line, they let all the people that had GE go before me and then let me go even though I was the first one on line.(Back then when I didn't have GE, was using MP.)
With the intro of Mobile Passport it seems GE is obsolete (except benefit of TSA Precheck, Land Entry and Nexus if you add that via Canada app).
Agree or Disagree?
And the biggest reason to get GE / TSA PreCheck is when flying domestic or even when flying internationally that you don't have to take off your pants and shirt to go through security.
mobile passport is only good for arriving at a destination while GE is good for arriving and departing.
No way to add that via the app , you got to apply for that and take an interview which would allow you to cross the border from the US to Canada by car and by plane.
Cost $50 for 5 years and free for children under 18 yrs of age.