If you look at the pictures of the knife attacks that generally fail, the greatest determination of survival is location, time and treatment.
If you are cut in a non vital area, you will likely survive.
However, that blade transects something vital like a major artery and you’re stuck.
Slashing cuts are highly dependent upon hitting nerves, joints and arteries.
But they are slow.
The old “death of a thousand cuts” comes to mind, slow and painful.
Stabbing, or sticking is a different matter, again unless something vital is hit, slow and painful. Some of the worst stabbing wounds come when the offender uses a sewing machine stitch style, especially on the neck/carotid area.
This generally requires a smaller knife.
You will note that most knife fighting cultures favor a large knife, the Gaucho’s for example and the methods used to lop-off fingers, hands, and the like by targeting the joints. The larger knife gives you distance, like a spear. And distance is your friend.