" In the example above, a 6th level monk specialized shadow is a prime option for multi-classing into a rogue assassin. Assuming the game lets us hit 11 (and because they mentioned they were looking at raising the level cap above the earlier stated 10 I think we can feel safe in assuming that) A 6 shadow monk/5 rogue assassin has equal damage as an 11 rogue assassin all other things being equal ( 11 rogue sneak attack 1d8+6d6 + bonuses 6 monk/5 rogue sneak attack 1d6 + 3d6 + bonuses, 1d6 + bonuses, 1d6 + bonuses, and potentially 1d6 + bonuses for a total potential of 7d6 + (bonusesx4). Lets assume the rogue has a 20 dex and a +2 rapier for +7 damage and the monk has 18 dex and a +2 short sword for +6 damage. Rogue average damage will be 4.5 + 21 + 7 = 32.5 while the monk average will be 14 + 3.5 + 3.5 + 18 = 39 or 14 + 3.5 + 3.5 + 3.5 + 24 = 48.5 using a flurry of blows."

see just breaking this down number one a 6 shadow monk only has 1-2d6 sneak in my example, paired with rogue 5 is 2d6, so this character is already more of a rogue than not a rogue but the rogue 11 has a sneak attack of 5d6. All those extra attacks on flurry are martial arts attacks including the offhand one you don't get to use the sword for the offhand if you are flurrying it specifically states ALL the extra attacks are unarmed, so theres -10% chance to hit for all of them and -2 flat damage the rogue hands down destroys in that example. The monk HAS TO SUCCESSFULLY hit all attacks, any single one hit for the rogue puts them way ahead in damage if it qualifies as a sneak attack and sneak attack is FREE, it has no resource to depend on like monk flurry does. after the the 6th round the rogue keeps going with an endless supply in the tank and you drop off. So your example actually perfectly highlights my point. SPENDING resources you are less than a dpt using a free ability. if the rogue hits one time and triggers sneak attack he gets 5 extra hits the monk only get 3-4, if the first hit for both doesnt hit, the rogue continues to have a higher chance to trigger sneak attack due to the higher accuracy of attacking with a magic weapon, and a higher DPH.