I think there isn't an issue so long as a man who used a bread knife that was lying around to inflict wounds that were not very serious on a woman he was dating would be treated in a similar way if it was his first offence, he was drunk, high, emotionally unstable and remorseful.
I am not sure why the judge mentioned the defendant's exceptional intelligence when he was considering his sentence - justice is carried out in public partly because it is supposed to send a message about the standards society expects and society normally expects a custodial sentence if someone turns abusive and uses a knife against a victim during a domestic abuse situation, especially given the worry about rising knife crime.
By not imposing a custodial sentence partly because of her intelligence, it's a strange message to send society that it is less harmful to society if intelligent, privileged, immature substance abusers stab a partner compared to less intelligent, less privileged, substance abusers stabbing their partner.