You’re not, it’s just that sometimes you paste your passwords outside browser, and opening a browser for that is doable, but feels wrong :D
Also, the app has a more convenient layout as it can afford more screen space.
Do you not have the browser open all the time? Not necessarily in the foreground, but at least in the background I always have a browser window. But tbh, most of the time it’s in the foreground on the second monitor