Using package name make store sense as package name shouldn’t change but app title can change at any time. I haven’t tried it yet, but if you haven’t already I’d recommend pulling up generic sharing menu if app isn’t specified.
Eg: when a user clicks the share button on any app it pulls a list of apps they can share to. It’s a built in function in Android and behaves VERY similar to specifying an app. The code is out there somewhere, I’ll try to locate it for you later.