This is an interesting point. In theory I get exactly what your saying, relationships with good friends etc do tend to just build naturally over time.
But on the flip side, it's been reported that arranged marriages tend to have higher rates of satisfaction than love relationships, which would contradict the idea that things need to develop naturally and without intention to work.
Also they've actually done studies on folks' happiness levels, comparing between folks that were given a choice between multiple outcomes vs folks that were preselected for a certain outcome and the people with the no choice and a pre-selected outcome were overall more satisfied with what they got than the people who got to choose. The freedom to choose usually comes along with the fear and regret of possibly making the wrong choice, especially with something as important as marriage.
I think at the end of the day it just comes down to the fact that "dating intentionally" is a paradigm shift for a lot of people in the West as opposed to some other places in the world because people in the West have been sold fairy tales about soulmates and perfect relationships, whereas in some other places people have a more "functional" view of marriage and mating. In a society where mostly everyone dates for love and/or lust it throws people off to come at things in a "functional" way. Especially so when you're already washed and clearly lacking other viable options
The functional/intentional route is a strategy that works best when you actually have the leverage to do it. Meaning you have to obviously be that much of a catch to pull it off. And what that means from person to person likely varies, but it's probably the only way to make that work.