2K Games did away with Create-A-Finisher for WWE 2K16. The system was clearly flawed due to difficulties with physics, so custom finishers didn't always look clean and realistic. But is that enough to warrant cutting it out completely?
No. Regardless of its flaws, people had a lot of fun with it. Like the backstage matches, it allowed players to be creative. And that's what really matters.
2K Games simply needs to develop the mode further. Edit it, assure it works, and please bring it back for 2K17.