In many cases, the camera is much less relevant than the artist taking the shot.
But there are a fair few cases where a better or more appropriate camera makes a big difference.
I need a lightning fast system for shooting on the streets so I use mft. If I were waiting for a compact to lock and focus the moment would be gone. Then there's macro. Long focal wildlife etc.
Yes, you can get long lens bridge cameras etc, but when quality is key, a high end long lens on an slr will make a big difference.
So, in essence, there are times when asking what kit was used is relevant, but it's not the majority.