I remember about fifteen years ago LH started filling Y from the back and putting the divider right in front of Y. The result was everyone was packed in to 3x3 and then there were many empty seats in front of the curtain. Frequent flyers got very annoyed and both let LH know and spent their money elsewhere in numbers - I was one of them.
LH backed off after about six months - so don't complain, book elsewhere including for C which is where it really hurts the bottom line.