Are you considered more apt to be a leader, or qualified to be a finance quant (even if you never trained for it) with a top school or your resume ? Yes you absolutely are.
Also "most of them don't actually work in tech". Yes, that. Programming is considered a dirty job in France by most people from grandes ecoles. They would all rather be architects or consultants. It sounds better on the business card. But someone needs to actually do the job. And this is why there are only tech services companies, but nothing close to a Google.