Totally agree about the difference in purpose. Casual dating or pre-marital sex is frowned upon in South Asian (and middle eastern) countries which makes dating sites a hard sell.
Since your comment was on top, I wanted to throw my two cents about how if one were to unabashedly formalize the requirements for viable long term relationships to optimize for search time, that's what you'll end up with.
Casual dating and short term relationships are a whole different thing.
(wanted to throw my two cents before folks start overgeneralizing about people from other nations/cultures. Which you're not, but others reading it might)