Anyone coming from a Judo background tends to get taught to stop using full scarf hold in favour of kuzure kesa gatame / broken scarf hold for BJJ, probably correctly since there are more submission options from there. But I always felt it was kinda useful in MMA/self defense. And occasionally worth trying in BJJ, since your opponent may not be used to it.
Here is Fedor finishing a fight with it:
What say the experts worth a try in BJJ or just a big no no?