How would adding a flex/utility position detract from someone's draft strategy and/or help 1 team specifically if every one of us was so focused on getting quality picks and sleepers in the late rounds?
Well, I think if we were going with that extra flex position from the start, some people may have held off a round or two in picking up their K or defense (for those that filled out their starting roster before any bench players), while instead picking up another RB or WR to fill that flex spot.
So you could be talking about someone now having to fill in a player they took in the mid to late rounds for the flex spot, instead of using say, a 5th or 6th round pick, where they took a K or DEF instead, and that is probably a pretty big difference in quality of player.
Quite frankly, I would be all for using a flex spot due the fact that I think my bench is pretty deep (I would have used Branch this week had it been implemented) but don't necessarily think it's fair to everyone to make that kind of change after the draft, and actually after the season, has already started.