Pen latency - see Samsung Notes on Tab S7/S7+
There are obvious issues with the Android app - mainly the temperamental ink shifting and lack of features vs. the Windows app. I don't want to seem ungrateful - the app is great, but Android is clearly Microsoft's least favourite platform for this app.
I don't know what the OneNote team is working on here, but maybe you could integrate with Samsung for pen tech improvements on their Android devices.
Coinciding with the Tab S7 and Note 20 series, Samsung released a new Samsung Notes app, and there is literally no visible pen latency. It is slightly glitchy right now, but the ink keeps up entirely with the pen. It does not have to catch up, it's just stuck to your pen at all times. It's very impressive. I believe they are using some software prediction for this.
I'd like to see OneNote integrate this into their own app. Samsung and Microsoft are collaborating more and more, so perhaps you can make this happen. Whilst you're at it, maybe you can get the pencil and other brushes from them, because they are sorely missing on Android.