Curtains should be given in 3ACE now because they were there in 3AC and now we will have to pay same fare for both.
2AC with just 52 berths compared to 80 now in 3AC is still a good differentiation and 2AC berths are of course more wider and spaciously placed compared to 3ACE (now 3AC) so adding curtains in 3ACE shouldn't be a big thing.