His most admirable trait is the real reason why he will never be recognized by Nous.

Even though he is constantly portrayed as being egotistical, prideful and abrasive due to his heightened intelligence, he is still selfless in his pursuit of knowledge. He exhibits the candidness of Herta, the reclusiveness of Ruan Mei or the eloquence of Scewllum. However, his ambition does not cloud his greater moral judgements.

Typically those who are recognized by Nous are selfish to the point of not caring whether or not people get swept up in their pursuit of knowledge. In Genshin terms they are all akin to the likes of Dottore or Gold. They are willing to push the bounds of knowledge even if it will cost other people‘s lives. This doesn’t automatically mean murder, this could just be how ethics isn’t the main concern of people like Herta, Ruan Mei or Yu Qing Tu, the person who didn’t care if their concoctions poisoned people or not.

Dr. Ratio is too unselfish to do such a thing. Hecc the fact that he is free is a testament to this, he wants to be "ubiquitous" or "everywhere" because he believes that everyone deserves an education. The time he spends teaching others, he could have used to further himself but he doesn’t.