As others have said, there many risks and not enough benefits. Shoulder impingement, excessive wrist/ulnar deviation, going from closed chain to open chain with the same load, going from shoulder internal rotation to shoulder external rotation at the top, going from one plane of motion to another, etc. If done with dumbbells, not going too high(1/2 way up?) would be better, but there are so many better exercises. For upper trapezius work, nothing beats shrugs. For middle deltoid, a proper side raise(neutral grip) will get it done. For those fans of it, you have 60 degrees of abduction of the shoulder in the internally rotated position before it’s bone on bone in the shoulder, you’re trying to go past that. Does that sound like a good idea?
Mike Campbell RTS