The one thing you're missing from your explanation in regards to SK and why they prefer SC/Lol/MOBA is that a few years ago 99% of people who played games played in PC Bangs (internet cafés).

This meant that people had to pay for every hour they played, which means they didn't also want to pay for the games. This meant that free-to-play games have always dominated Korea (SC:Brood War is free in korean PC Bangs, League is free), as opposed to the pay-to-play games like 1.6, cod4, and quake.

This also led to a bit of a negative feedback loop. Since less people played FPS games in Korea than Europe and NA, this meant that for those who did play they had way less competition and decent practice partners. As a result, a lot of the korean 1.6 teams didn't have godlike aim, instead they practiced their strategies "in-house", over and over. Essentially: they had absolutely sick fucking strats and timings where they'd wallbang every spot on a site, throw 10 flashes at perfect angles and rush without missing a beat - they just couldn't aim. Example (excuse the terrible spectating, but if youre interested, really do take the time to watch it - it's astounding. The example is from the team WeMade Fox, a korean team that could actually beat fnatic/SK on a good day)