> the feedback you get is minimal
I've been in hiring roles for 15+ years and I've interviewed somewhere around 1000 candidates. I don't work at Stripe, but I can probably explain why you didn't get feedback.
Giving candidates feedback is really fraught. First, even honest feedback is unlikely to be satisfying. It's entirely possible that your recruiter told you exactly what the team's feedback was. "Your answers were fine, but we want better" or "... but candidate X was stronger" is super-common, but very unsatisfying. Second, while some candidates take feedback well, most don't. When I've been specific -- e.g. "your answers to questions about software architecture fell short" or "you didn't clearly demonstrate experience solving production issues" -- most candidates argue or get angry. People are really, really bad about taking criticism well. I've even had two candidates threaten to sue me, and one threaten violence. These are obviously outliers, but they do happen.
Finally, the upside is limited: to the company, what's the value of feedback? We've already decided you're not a fit, so what value is feedback to us? Especially if, as I've explained, you're unlikely to get much value from it either?
The best way to get feedback about your prospects as a job candidate isn't from someone a company you're interviewing with. Instead, ask someone you trust to conduct a mock interview with you and give you feedback. You'll be more to be able to listen if it's someone you know has your best interest in mind; they'll be more likely to give honest feedback if they know you'll take it well.