The only benefits I can see of "Apps", are the developer get's access to private information they really don't need.
Yeah, they get to be on the "App Store". But the "App Store" is a totally unnecessary concept introduced by Apple/Google so they could scrape a huge percentage in sales.
Web browsers have good (not perfect) sandboxing, costs no fees to "submit" and are accessible to everyone on every phone.
That said most of the time you are right.
I am fairly convinced that some apps are just wrappers around web apps. The Virgin Money (Uk bank brand) app used to ask for cookie permissions on launch and felt very like their website used to (until it was removed and they went app only).