It is fairly common to use the Kickstarter process as a "bonus" editing/playtesting pass to various degrees. Some companies share pre-layout PDFs at an early stage, which allows backers to have quite a bit of playtest influence – that's obviously not going to happen here, because one of EN Publishing's selling points is that you get the PDFs right away when the kickstarter concludes. Others share laid-out PDFs which restricts backers to typo-catching (because if you were to make bigger changes, that would require reflowing the layout which, if you're unlucky, can take a significant amount of time you don't want to spend).
As a general rule, I think delaying print by a month or two in order to have thousands of eyes poring over the documents in order to catch mistakes is a good idea, but it's not my project so it's not my call to make.