Yes, I have built it as a website app also and that is the primary UI. The mobile app is just a read-only viewer for quick access to the information people need on the go. It's not entirely pointless.
A lot of people don't know how to install a PWA (which I also provide, if they want it) and have never done so. They also just expect there to be an app in the app store and when they hear about a tool someone else is using that's their first port of call.