Counterthought: I've been running a popular web-only site for about 5 years now and I get a little under a hundred requests per month for it to be made "into an app". A lot of users just want to be able "to install it" or to "get to it from my home screen" or "to get to it faster" (even after pointing out they can add bookmarks to home screens). It's also tempting from my POV to make an app just for discoverability reasons (e.g. users browsing the app store discovering my site).

I haven't made an app (don't know how!) and I definitely wouldn't add a "download our app or else!" banner/wall, but I've been extremely surprised from the other side of the table to see just how many users seemingly just want an app for an app's sake, even if it's functionally no different from a responsive mobile view.