Soul brand doesn't work. The +2 acid damage ring doesn't. The +1d4 psychic damage if concentrating doesn't work. Sneak attack doesn't work. Probably a whole bunch of other stuff I haven't yet tried dont work either. Yes, if you specifically make a tavern brawler build, unarmed attacks are just fine, but the actual core mechanics of a monk are focussed on dexterity and are supposed to allow flurry of blows being combined with weapon attacks effectively. If you arent specifically tavern brawler, monk is hardly overpowered. I don't really understand why so many damage boosts do not apply to unarmed attacks.