Looking at the Pit Fiend entry... I have misgivings about this 'Tactics Round by Round' thing that reads like the instructions on the back of a shampoo bottle. All they're missing are the words 'rinse and repeat'.
It seems to me that listing the most effective tactics for each monster in the MM with 'Tactics Round by Round' just gives players an even bigger reason to know the MM by heart, and make every character have a 'Crocodile Hunter'-like knowledge of all the published monsters they could face. Seems like they just made it harder to control metagame thinking and 'out of game' knowledge just to dumb down what the monsters can do for everybody.
It seems to me that listing the most effective tactics for each monster in the MM with 'Tactics Round by Round' just gives players an even bigger reason to know the MM by heart, and make every character have a 'Crocodile Hunter'-like knowledge of all the published monsters they could face. Seems like they just made it harder to control metagame thinking and 'out of game' knowledge just to dumb down what the monsters can do for everybody.