I feel like theres just a really weird obsession of Korean talent right now. Aside from DRX and T1, the quality of Korean pros are really not that much better than the average SEA pro, especially in tier 2. And the argument that Korea had the 2nd and 3rd best team in pacific does not make sense. Korea had 3 teams in the league while SEA teams had one team from each country. And T1 does not prove that Korea has a deeper talent pool, especially in tier 2. T1, aside from intro, consisted of Korean players who were already established and played outside of Korea (NA and Japan) alongside a coach that worked in NA. The development of those players is not the result of the Korean T2 environment. No other region benefits from that. But despite that, it feels like orgs think picking up a random T2 Korean player will be the final piece of the puzzle even though talent from the rest of Asia can probably provide the same thing.
Also I think another big reason is that the league is based in Korea and its way easier for orgs to pick Korean players as they don't have to deal with visa issues. That's honestly pretty fair but it can be really damaging to the rest of Asia. Honestly I wished riot changes the location of the league every few years if its possible because at this point Korea, Japan, and China will have such a large advantage because they get to regularly practice with the best teams in Asia with decent ping while Korean talent just gains an insane advantage that makes them more likely to be picked up because they don't have to deal with visa issues. I'm pretty sure this same problem is affecting Brazil and LATAM in Americas as well.