Sometimes XBot stops playing with 1 or 2 fights left for the next dayly chest. When that happens people manually play 1 or 2 matches to top it off. Using BH in that instance for ranked is very common.
Also, I dont play tournaments but I do play brawls and I use it in many brawl fights (not all), but most of the time I make little changes to the teams suggested. I know this might not be what everyone is doing or even the majority but I think its a nice example to give out diferent perspectives.