Why do you assume mafia will break up partnered players? Why do you assume that strategy removes mafia's flexibility in kill choices?
Do you think mafia will kill their partners or break up townie pairings? I can see benefits to both of these for the scum to do.
Why do you assume mafia will not break up partnered players?
If I was mafia, I know that hidden communication can be extremely valuable to town and dangerous to the team. Aside from a reveal of a town PR or similar reasoning, why would mafia waste time killing a player without hidden communications when they can kill somebody with hidden communications (in this context it's the same as a town PR).
It doesn't remove flexibility... it increases it while also providing them a means to be exceedingly efficient!
If I was mafia, I wouldn't bother killing my communication partner. Collusion to spin a narrative and span it across a number of players to grow seeds of doubt about critical aspects of the game... or kill them... yeah, pretty hard choice!
Why would you want to provide mafia with information that helps them be even more efficient about who and when to kill?
They are almost guaranteed to eliminate a couple town-town pairs the first couple nights just by randomly killing anyone not partnered with scum.
This. But, if we give them a full disclosure of pairings, then they can efficiently kill off a single member of each grouping to maximize effectiveness. Which is exactly why I'm not liking the mass claim stuff.