Humans by nature overwhelmingly tend to be serial monogamists, so I do think most people (regardless of their IV stacking) consider these relationships a high life priority. But IME not everyone treats it as a primary existential priority like Sx-1sts do. There's also a significant distinction in the qualitative kind of relationship that Sx-1sts seek, which markedly differs from what other IVs seek.
Can you explain this qualitative distinction that you're referring to?