Well, I suppose it's up to the creator to decide if the people they potentially alienate by putting information behind a paywall are balanced out by the people who like to feel special. The thing is they'll never really know why someone chose not to pledge.
Viewing post in The Thorns of War Update #5 - Kickstarter Draft comments
I can't actually think of any game campaigns that had no backer-only updates whatsoever? Transparency is important for backers, which is why there are updates in the first place, but it doesn't change anything if they're the only ones who can see a post. That only affects people who chose not to back it.
I think it would be unusual to go digging through Kickstarter logs to figure out whether a game is for you. Once the game is out, people can judge the quality themselves by reviews or demos.