Me and my batch of high school buddies managed to get into IITs (and NITs which are a step down from IITs) while putting in some work, but not killing ourselves. All of us were athletes, so a 2-3 hours of sports daily for us was a must. All of us did some amount of coaching, and though the coaching classes gave us enough exercises to last us the entire month, daily, we had enough sense to figure out how much practice was enough practice. (Surprisingly, it's not a lot) Most of us did have other hobbies, some of us ended up pursuing them full time.
Yes we always had the kind of students the article mentions, spending each moment they're not asleep on DPPs (daily practice problems). Guess what, some of them made it into IITs (which they would have even if they put in less effort), but a lot of them actually never made it despite putting in that effort.
Not all of us are the soulless robots described here.