How does that matter ? - when a user clicks on a search result they expect to get the content described in the snippet. If you're unable to deliver that content on mobile then it makes perfect sense for you not to show up in the search results.
If a user is searching for a product and they click on the link to that product in an ecommerce store, they want a product page not your app.
That makes sense, but only when searching on a mobile browser. It seems like Google should show different results based on the user agent if penalising for poor support of that user agent.
If a user is searching for a product and they click on the link to that product in an ecommerce store, they want a product page not your app.