I still have version 2.6 installed on my Windows computer and I opened it this morning. Icons are set in color on this computer. Well, I prefer the monochrome icons now. To me, the color icons give an old software look to the app.
Since I arranged all my studios tools to my liking I feel comfortable with all of them. I would not go back to color icons. But I can understand that some people miss those color icons. I don't understand why the option to allow users to choose what they like has beed removed. There must be a hidden switch somewhere.....