Since so many people here are talking about how "in science it's different, you need to just chill out. Science is all about creativity and you shouldn't work hard if you're in a "creative business"", let me just leave this link here: https://terrytao.wordpress.com/career-advice/work-hard/

If one of the best mathematicians of our time is saying "Work hard", it probably means more than some rando who writes for some blog.

If you want to just "chill out" and live a fun life, feel free to do so, the world would suck if everybody worked hard. It's actually great that you guys decide to believe working less is good for achieving what you want, because the ones who actually know what's up have higher chance of success.