I only use the large eraser when I want to quickly erase a large portion of the screen. It would be great if, after I do that and select another tool, the eraser size would return to a default (which, in my case, would be the small eraser). As things stand now, I never think to reset the size. So, the next time I double-tap my Apple pencil to engage the eraser, it's still on large and I end up erasing tons of stuff I don't want to (this requires me to undo those changes and then change the eraser size).