Sorry for asking so many questions but im playing a lot lately.
Does man the watchtowers: "if an ability or action would deal damage to your hero or to royal guards you control, intead deals half that damage, rounded down"
Completly shuts down the monk since all his abilities are deal 1 damage?
Once the monk builds enough Focus Counters, his abilities start to do more than 1 damage each time. Also of note is that his abilities can target units as well, which Man the Watchtowers don't protect (unless they are Royal Guards).
Man the Watchtowers definitely makes the game trickier for the Monk, but he still has a good chance to win!