For all the feedback Adobe is getting, they still don't seem to understand what their customers are actually using their software for (hint: it's not drawing with butterfly shaped brushes on top of a 2 image collage created on an iPad).
When I first got to try the beta a few weeks ago, like so many other designers whose input Adobe wanted, I thought the features looked promising and was assured that this was an early version and the experience/performance will improve.
One month later, Adobe has released the same laggy mess without any notable improvements. Are art-boards a good idea? Sure. Just imagine how it will all work when making a few of them in a raster graphics editor. Hell, make two blank ones and see how even scrolling becomes laggy.
While I am not switching to Sketch, I would like to have one design tool in my computer that doesn't lag when I create a second art-board or turn making even the smallest changes to complex documents feel like I'm working on a Powerbook.
I will conclude by saying that I agree with @Jon Myers's point - that we need well crafted, efficient software, tailored to our field and built from the ground up to take advantage of the powerful computers that we have, not some 20 year old pile of crap Adobe keeps putting sprinkles on hoping someone will love it.