Would they have considered the Borg brethren? Would they have felt they could have changed the nature of the Borg...for the better? And how would the Federation feel with a kind of proto-Borg culture like the Bynars within their borders? In all, not revisiting the Bynars seems like a lost opportunity.
About my only quibble with the episode is - as usual - the writing of the Picard character. Here, he spends the first half of the episode thanking profusely his crew for a job well done, complimenting them over very, very little. I suppose his pervasive good cheer was an attempt to soften the stern character, but it plays as strange; like Picard has taken some brand of mood-altering drug like Prozac. Suddenly the good captain is spouting "thank yous" and "well dones" repeatedly, as if in some kind of euphoric state. Later in the episode, Picard also reveals his total lack of awareness of others, when he horns in on Riker and Minuet and just...won't...stop...talking. Can't he see that they would like to be, you know, alone? Eventually he realizes it, but only after quite a while. Again, I'm not criticizing the dignified Patrick Stewart, only the writing of his character.