I think for companies, the main advantage of an app is the opportunity for uncontrolled data ab/use. Let me explain. Say you order food online — you’d want a notification to update you, instead of having to manually refresh a webpage. So you prefer using the app. But what’s the guarantee the company won’t also send you marketing notifications? You give contact permission to access just one contact, but what’s stoppin…
Browsers have a notification feature where websites can send you notifications, and it's usually enabled by default.