I disagree with your opinion. I think being the shorter person in a fight is generally a disadvantage.

All else equal, the person who is taller will likely have more mass, and thus have more muscle to utilize against you. They’ll also have a bigger wingspan, so their zone of threat is bigger.

When I used to study martial arts, my instructors always used to say “don’t bring anything to a street fight that you don’t want taken away and used against you”. Unless you have the element of surprise, and are using a knife that’s attached to your body, welding a knife against someone bigger may backfire. Being a master of de-escalation tends to have a better mortality rate ;)