I disagree. Flanking a foe has been the desired goal of melee combat since the earliest days; ever been sacked from the side in football?I hate that optional flanking rule in the DMG that gives you advantage. It is lazy and unbalanced, especially toward PCs who will normally be the ones swamped by smaller, more numerous foes. I changed it to +1 damage if you hit, my own houserule. It's not enough to be too much, but enough to make you think twice about getting flanked, and enough to position yourself for bonus damage.