We have first hand accounts of professional pilots stating what they observed when they worked at Asiana and in Korea. It is evident there is a widespread deficiency among Korean crews (definitely not the only ones who suffer from this) to conduct proper visual approaches and landings.
Now take that pre-existing factor and add it to what would be a perfectly standard approach on a CAVOK day for a competent crew, take away the ILS GS, the VGSI, and suddenly these guys are left clueless.
No doubt the final report will indicate a clear point at which any other competent crew would have initiated a go-around due to the stabilized approach criteria not being met.
Hopefully they will learn sooner than later.