Automatic page centering is visually pleasing, yes. However, page centering (meaning you are unable to zoom anywhere you want to (for example, having 70% space and 30% page on your screen)) is very impractical. It means you have to move your arm and wrist around to the very left of your device and then to the very right when writing full pages. This is not only very tedious and strenuous on muscles, but it is also genuinely very annoying to deal with.

Make page centering or realignment an option, there's a reason why most, if not all, drawing programs don't have that as a feature.