The way the sign-in screen slides up over the entire app when you use a sign-in action on a button is just fantastic. It would be amazing if we could have a screen like this for things other than sign-in. You could use a screen like this to inform users of new changes you’ve made to the app since they last logged in (Discord does this all the time). You could use a screen like this to have people agree to Terms of Service and Cookies ( which would then unlock other parts of the app). In general, a slide up screen would give the developer more variety for how they present information to the user.
Such a feature (and many other current features) would also work REALLY well with some kind of action trigger than happens upon tab or screen navigation. Where simply moving to a specific screen or tab triggers one of the core or custom actions. When users sign into the app, the first thing that could happen is such a slide-up screen appearing and telling them that Terms of Service has been revised and they need to agree again… or a screen telling them new features have been added and what they are.
I have to imagine most of this is somewhere on the roadmap, but just want to drop it here anyway