I don't care what the app is. The split second it starts using notifications to send unsolicited marketing, it's notification privileges are revoked and I seriously consider deleting it. And I run very few apps to begin with.
"It's better in the app" is, usually, just "better for the publisher" and, rarely, for the user. Use the web unless there's no other option or the app affordances (e.g. real-time navigation, health monitoring) are too valuable.