What is the state of the Panno variation of the King's Indian Defense Saemisch? In the Saemisch King's Indian

[FEN ""]
[StartPly "10"]

1. d4 Nf6 2. c4 g6 3. Nc3 Bg7 4. e4 d6 5. f3 O-O 


It seems current (2017) literature and practice promotes Black's play 6...c5.  What I am wondering is there something wrong with the Panno (6...Nc6 with a6, Rb8, b5) that got players to move to 6...c5 or is it just the current trend?
The Panno is a sharp line that has received a lot of attention lately, particularly the variation below where White opens the centre favourably. The variation isn't refuted by any means, but Black players have found this variation to be uncomfortable.

[FEN ""]
[StartPly "12"]

1. d4 Nf6
2. c4 g6
3. Nc3 Bg7
4. e4 d6
5. f3 O-O
6. Be3 Nc6
7. Nge2 a6
8. Qd2 Rb8
9. h4 h5
10. O-O-O b5
11. Bh6 Bh6
12. Qxh6 e5
13. dxe5