I can definitely understand not wanting to over-hype anything or give the wrong impression, but due to the nature of kickstarters where many fade/die out/have problems, having some updates so that those that didn't back know it's still alive seems necessary.
Why? If you are a backer then you get access to development logs, so you know that your money is being used to do something and the project hasn't died. If you aren't a backer then you didn't invest anything in it, nor do you really have any stake beyond a tertiary one in the way the game develops. (Other than risking hype burnout).
I mean, you haven't spent anything on it, nor are you going to spend anything on it until it's actually ready for release, so why is it important that you know that it's still chugging until it's actually approaching time for said release? Even if you forget about it for a while ideally you should hear about it again through several channels when it actually releases and shows up on steam or something similar. After all that's kind of the point of kickstarter updates; to show that the kickstarter is still chugging along to those who put money in despite the fact that there isn't going to be any visible developments for everyone else for quite some time.
I get that it's nice to be involved, but I'm not quite sure where you are getting the sense that developers necessarily need to show to the people that didn't (and can't) give back to them in any way until they are actually done that they are still working on a particular project.