JPs are optional, so there is no pressure to use them if you prefer another method. However people have found that JPs are convenient because they are almost impossible to miss on the site. A JP notification will show up on the left hand navigation bar for all contributors when there is an update, and will also show up on a Users My Game page. It allows privacy and collaborative additions and editing in such a way the all contributors can see what was changed and by who, things that could get overlooked in bouncing an email or google doc back and forth.