The difference between a knife killing vs a gun is that a knife is considered much more personal. Note that hit men and cartels normally use guns.
The fact that Kohberger used a knife changes things in my mind. Why not just shoot a victim outside in the parking lot? Why go in the house when this is 20 times more risky for many reasons and 20 times more risky to touch victims and get their blood on you etc....
If he simply wanted someone dead, to be quite frank, there are less riskier ways to go about it.
The fact that he brought a large knife into a private residence with the intent to - do what he did - is not a far cry from having plans to physically and/or sexually assault his victims.
Not a far leap to think he may have had some intent in that direction. However, from what we know he did not touch them in any way before stabbing them, which is all that matters.
Opinion plus link.
Four Classifications of Crime According to Criminal Law
Personal
As its name suggests, personal crimes are crimes committed against a person, which affects them either physically or psychologically. Rape, assault, and murder are examples of personal crimes. Robbery, which is also categorized as a crime against property, is also considered a personal crime in that it causes physical and emotional distress to the victim.