I agree with you that STEM don't hold a monopoly on intelligence.

> engineers that can't get laid in Singapore are the same "brilliant" engineers that can't get laid in their home town

Maybe so, but not for the same reasons. Back in their home town, they cannot vibe with anyone because the few who might be compatible have long since left. In a STEM hotspot, they go to an event and meet compatible people, but it's 11 guys for every 3 girls, so unless they are top dog in that room, they aren't going to score.