Would you mind elaborating on what complaints you mean? Blender has had multiple major UI overhauls in the past few years, and changed a lot of basic command assignments in the process. They even moved selection from the right mouse button to the left button. That was the #1 complaint I used to hear all the time from everyone, and it was resolved a couple years ago. So I’m very curious what you’re referring to, and whether you’ve used it recently.