Anyone tried onboarding with open-ended questions instead of multiple choice? Here's what I'm seeing [I will not promote]

I'm building a consumer social app (keeping it unnamed since that's the rules here, happy to discuss the mechanics though). We made a weird call early on: instead of the standard onboarding (pick your interests, upload a photo, done), we ask ten open-ended questions. Stuff like "what's something about you that most people get wrong?" No multiple choice, no skipping... okay, you can skip, but most people don't. What's surprised me: completion is way higher than I expected, and the answers are genuinely thoughtful. Like, paragraphs. I think there's something about being asked a real question that flips people out of "filling out a form" mode and into "talking to someone" mode. The tradeoff is it's slow. It's like a five-minute onboarding in a world where everyone's optimizing for thirty seconds. And I keep going back and forth on whether the depth is worth the drop-off. Has anyone else built something with a slow, deliberate onboarding? Did you find the people who stuck around were actually higher intent, or were you just filtering for patience? I'm trying to figure out if I'm being principled or just stubborn here.