I suppose Feedback Assistant is like Windows' Feedback Hub. Users fill it to the top with shit making it impossible for Apple or Microsoft to do anything useful with the feedback.
Do users even use Feedback Assistant? I have yet to hear of anyone in my circle (friends, family, coworkers) submit a Feedback. None of them are developers or us the developer beta of iOS, so I have always surmised that to be why.
The app is installed but hidden by default unless you’re running a beta (and in my experience I’ve never gotten a reply to a report unless it’s on a beta). You can use the website or launch the native app with its URI scheme but approximately nobody does that unless they’re really frustrated with a bug and know Feedback Assistant exists.