I totally agree with what you said. We need more personalized education systems. But this article is a red herring. If you actually read the data and figures from the article, the conclusions have been twisted to create clickbait. In particular, the article talks about persistent INSTABILITY of sleeping schedules. "We quantified SJL as the difference between the average phase of activity on class days and non-class days." This has nothing to do with the disadvantage of night owls to non-night owls, but rather talks about the disadvantage of folks who oscillate their sleeping schedule from day to day. It doesn't matter if you're a night owl or not, that's going to kill anyone's productivity. The audience read what they wanted to read, and interpreted this as "night owls vs. early birds".
I'm a night owl too. I dealt with it. It wasn't easy - you have to be disciplined with sleeping schedules. I have to work out every morning to push my body awake. I have to eat right. I have to get regulation lights and blockout curtains and earplugs and meditate before sleep. Good things have never been easy.
Wow, our society loves to blame our problems on other people and "the system".
"Social jetlag correlates to GPA". Hmm, maybe the students who prioritized school and didn't go out drinking every night ended up doing better.
You don't "deserve" good grades just because you're smart. Work hard for it. Get up early. Go to bed. Prioritize. Give something up. That's how life works.
here's the original article for reference: https://www.nature.com/articles/s41598-018-23044-8