The dream, for me, would be a companion iPad app that mirrors my screen but lets me draw on it. Sidecar solves the screen mirroring part -- supposedly Mac apps can also make themselves apple-pencil aware, so maybe such a thing is doable?
Yes! Sidecar should have the option to show the iPad screen for presentations in OSX. Drawing apps on iOS are much better suited to live-doodling with a pen than OSX ones.