It is not just about internet connection, it is about being able to rely on having the info avilable at will. When an app cannot be trusted to do this, there is zero reason to use it. Take a boarding pass for example - you really really really need to know with 100% certainty it will be there when you need it. Boardingpass on paper has this property. An app that has the tendency to log out once a day or week or whenever AY has decided, is no longer an app for the traveller. And sure enough - it is intentional. The app presents itself as a "Finnish retail shop" with the purpose to sell you stuff.