If we where there for earning money, I would 100% agree with you. Indeed, the outcome doesn't depend on animation, and the look of a tool doesn't matter as long as it does the job. But I think everyone complaining knows about it and yet they(including me) still complain. Why? Because we are there for entertainment, that's why. The outcomes don't depend on design of slot machines, but there are hundreds, if not thousands, different kinds of them, and new designs have been invented all the time. That is so because people prefer playing on those they find attractive, even though they know well that it doesn't affect the outcome of their play.
We can't do that on freebitco.in's FREE BTC page. Read the two replies above your post, or check it out yourself.
With that said, I think it's a minor disadvantage, and I will keep playing on one of my favorite sites, regardless of whether the animation will be changed or not. I just wanted to help in making it a bit better from my point of view.