I'm not sure what you mean by this, as it is F that has the fixed divider between the middle F seats -- J doesn't have this. F has an additional raisable partition screen; while J has a small screen by the head area, basically to block line of sight. Your description sounded like F and not J.

One of the drawbacks of the new J seats is for groups. LH tried to market their "open spacious cabin" against BA when BA introduced suites and partitions, but it didn't work (nobody was fooled). But your example is a good one of when the old less-private seating is actually desirable. I guess the premium airline market has evolved away from groups to single travel.