This is only enabled for the #meta category for testing.
Aha, Now that you mention it, I thin I did read that … The funny thing is, that I did open one of my own threads, to see if the button is still there. … It was … But I didn’t pay attention in which category it was … It must have been Meta 
Do we want to turn it on for #discussion? Any other categories?
I think it would be worth a try. … I personally think it’s satisfying for the author of a solution, if you get the feedback that it worked. And other users with the same or similar problem get a hint, what they can do