As I've mentioned, frequent updates can carry negative consequences. Some newer features don't seem to be particularly well-developed or even tested. The new-ish "text tool" is a welcome change from the original "title editor," but it feels incomplete and lacking. The Team Projects feature has led to the loss of a full day of editing work, which made an already tight deadline even worse. Converting sequence files into After Effects compositions can be sort of buggy. These are specifics, but of course, there are instances of tried and true features which randomly become broken upon updating. These are typical software development headaches, but it happens from time to time.
I'd once heard Adobe chooses to compete for their development teams against one another instead of cohesively collaborate. I've no source on this other than gabbing with co-workers who'd visited an Adobe office at one point, but the more I've used Adobe software, the more I believe this to be true. Some Adobe programs use different keyboard shortcuts to accomplish the same command. Sometimes .psd and .ai files don't play well in Premiere. All other programs allow holding spacebar + hold left mouse button to scan around your image (or in this case, program monitor), but for some reason, Premiere doesn't support this same functionality. Why can't I scroll into the program monitor to zoom into the image? Instead, I have to click and select a zoom, then I have to use scroll bars to position the monitor onto the desired part of an image. It's frustrating and causes more trouble than good.
I'm appreciative of the options I have in Premiere Pro, but other Adobe programs do different things better. Of course Illustrator is great for design and illustration, and of course, I can't expect Premiere to run similar keyframed motion like After Effects. It would be great to have basic motion blur functionality, or a streamlined shape layer editor, or maybe a mask editor that didn't automatically apply a feathering to each mask I create.