I'm a long-time NI user. I started with Kontakt version 1.5 on CD, and have now been a Komplete user for a long time. I also use a Maschine+ for noodling around on the couch, and as a controller for my main setup which is Cubase on Windows.
The one thing that really annoys me with NI software, is how cramped the UI is, and how it can't ever be expanded or resized. I remember it was a major improvement when Kontakt got the ability to expand from, like 1024 pixels wide to 1280 pixels wide or something, and that apparently took a very long time to do ... and since then, nothing.
Similarly, the Komplete Kontrol UI has about three lines of instruments available, unless I roll up the kind and flavor selector boxes. But what if I want to browse both kind/selector and actual instrument patches at the same time?


That's not to mention that, because I'm a long-time user, smaller text is becoming harder to read, and there's no way to increase the font size. NI instruments also don't pay attention to system font size or accessibility settings.