Its switch to a swiping interface didn't happen until a couple years after Match bought it. And everything became like Tinder, not just Match apps. Because it genuinely worked better.
And yeah I can totally see how the long profiles could be useful for finding friends. But that's not what the site was ever primarily meant for.
The reality is that OkC basically started out for grad students in Brooklyn to be able to find each other, the kind of person who loves writing and reading profiles. But that's not most people, and so as they expanded across the country they shifted to the format that worked better for most people.