You are making a great point. There is an inherent trade-off between customisability and simplicity. That is not necessarily a problem though because I think there are different target groups depending on where your product is on this scale. I like to think of productivity software as a pair of shoes where everyone has their preferred size and fit. That also allows different tools to successfully co-exist.
The desktop application is Electron-based, so porting it to Windows will be relatively easy. For mobile we go native though and that's why a native Android application will take some longer.