FWIW: We’ve had our Clarity for more than 3 1/2 years and have never installed or used the app. If I’ve missed something important, it probably wasn’t that important. A recall notice is about the only correspondence I want from Honda, and that would come in the mail or I’d learn about from the dealer during the annual oil change.
Nearly every Hondalink discussion on the forum is about some sort of annoying behavior. It won’t connect, won’t update the odometer, won’t charge when it’s supposed to, stops charging when is isn’t supposed to, won’t start climate control, won’t unlock the doors, sends constant emails, etc. I haven’t been annoyed by any of those things and the car works just fine.