It is because at ASEAN level, local teams are just that more tactically and technically able to defend; a trait not appreciated in the region but very important if one is to reach the next level.
Afterall, if one cannot defend then one will start on the backfoot as Sriwijaya show even (according to some) if they do form the Indonesia national backline with of course a Singaporean as well.
Scorers: Taisuke Akiyoshi 7', Federico Martinez 64'(p), Indra Sahdan Daud 89'(p)
15 Rezal Hassan (GK)
2 Shaiful Esah
5 Niklas Sandberg
6 Ivan Lovric
7 Ahmad Latiff Khamarudin (19 Mustaqim Manzur 77')
8 Daniel Bennett
10 John Wilkinson (C)
13 Federico Martinez (11 Rhysh Roshan Rai 82')
16 Noh Rahman
17 Indra Sahdan Daud
21 Taisuke Akiyoshi