I mean, from the feedback from the players the problem with barrelmancy was about how convenient it is to set it up before patch 5
but if this setup will take hours after patch 5, then I don't see it as a problem or find myself think about it even if it is gonna one shot all the bosses in the game
granted I have not try barrelmancy before or after patch 5 so I don't know exactly how convenient it was
In the Reddit thread where this was posted, the person who made the video said it took 3 hours.