I can definitely see how a backer with strong DRM feelings would feel betrayed right now. No one should argue against that, it makes sense for them to feel that way.
That said the game looks amazing, exactly what people wanted, and that's the core importance here in my book. As someone who prefers DRM free but accepts Steam/Origin/Uplay when necessary, I am still very excited for the game and hope this doesn't derail a successful release and further content from the development team.
I think people upset about Steamworks are very few and far between, for better or worse.
Having not backed that project I shouldn't be complaining at all. Even : I pre-ordered Age of Decadence, several month later they were greenlit so they proposed steam keys for preorderers .... I'm fine with it.
Now, this is kickstarter, so it's far from a common pre-order, there are risks that many backers are certainly not aware of. Backers SHOULD expect a carefull planification from the devs, because, for once he devs get paid in advance. Now in this case the planification didn't seem perfect because the devs reached the conclusion 'After a lot of prototyping and research, we decided that our best delivery option for OSX/Windows/Linux is to go the route that great games (like Skyrim!) have taken and embrace Steam and the Steam Workshop.)'
THIS is not good planification in my dictionnary, they should have knew/said this from the start.
Long story short, It sure looks like a great game I totally agree with you, being a former Shadowrun 2nd ed' fan I'll probably get it when a good opportunity occurs. But, because it's the first big kickstarter videogame project to do 'shaddy' things, it's a good thing to rant a little because backers and guys like me can't do much more than complain if these guys begin to deal shit after all.
......That and I'm french so I have to whine on a regular basis.