Frank gets picked on the most, right or wrong, because he's the point guard. And, as a pg, you bear the main responsibility of running the team, i.e., the QB, Floor General, etc. That position is bar none, the most critical position in the game. As the guards go in college hoops, so does the team go.
As others have alluded, the problem is Frank isn't a point guard, and he doesn't & never has possessed the skill set required to play the position, certainly not at this level. This isn't anything new, last year in games we lost, many of the same Frank problematic tendencies, inadequate skill set, etc. were present then, as they remain today. JB saying that Frank can't get by anyone after the FSU game, he could've made that same statement last year, the only difference is that Frank is a senior...and last year there were no other options. And, just as JB also stated after the first BC game, Tyus is simply better with the ball and in making plays than Frank. Really, go back and revisit some of those games last year, especially the teams that placed a lot of emphasis on ball pressure, etc. The season before, we had a 5th year grad transfer over take his minutes because of similarly related matters.
I feel a large part of the onus is on the coaching staff, as their hope/belief of converting him to a point has been detrimental. You may contribute that to lack of player development, the individual's work ethic himself to improve upon, or both. But one thing is apparently clear, if you do not already maintain the skill set required at point (or at least have a strong base) before arriving on campus, especially at this high level D1/P5 ball, well, good luck as you're simply rolling the dice.
Now, Frank does possess a very nice looking J. He gets excellent elevation, nice release and follow through, while keeping his legs straight up and down. He just has never been consistent at making them, especially for a 2 guard, which is what he has always been. Hopefully, in his remaining games, he can get more of them to fall, get hot/streaky, that would be some especially good timing come March. I think that's really the best we can hope for as fans for the remainder of the season.
What does bother me the most about Frank is a couple of things Corduroy mentioned above. His antics after making a three, etc. and being a relatively lazy defender on D. D is mostly effort, grit and mental toughness. And, that instance last night in that critical possession where Barrett hit that 3 with only a second or two on the shot clock was brutal. He never slid over or even make an effort to do it, leaving OB in the dire position of choosing to flank to the corner to cover an open O'Connell or staying put on Barrett. That, along with that costly T/O when he picked up his dribble, then gave an half-assed effort getting back to stop the ensuing layup.