The problem with Visual Studio was the sudden removal of color changed people's "muscle memory" on where certain items were on a complex toolbar or menu system. I have no idea who thought that was a good idea, but some design team decided they were going with it, and they did.

When everything suddenly went black and white, it was impossible to quickly distinguish one thing from the next.

They reverted the decision and suddenly all the colored icons came back and it was once again easier to quickly pick things out.

I mean, people freaked out when they changed just the VS Code icon:

https://visualstudiomagazine.com/blogs/data-driver/2017/10/v...