Of course it is. Because PB didn't tell you this is so in those exact words it doesn't fit with your mantra and therefore is incorrect. The rest of the fighting world is clearly wrong. A BJJ practitioner doesn't look for submissions they react to what they feel, a wrestler doesn't look for opportunities to throw they react to what they feel, a boxer or MT fighter at clinch range doesn't rely on seeing the next punch coming in they react to what they feel in terms of impact on either their body or their gloves. At distance you have to use your eyes to determine what is happening but at close range you can't possibly see everything, process the information and respond quickly enough.
When you throw a punch at someone and it gets stopped do you
a) stand there dumbfounded wondering what to do next
b) look carefully at your arm to determine what just happened before making a decision as to what to do next
c) ignore everything and follow a set sequence of moves X follows Y follows Z like a robot whatever the situation
d) react instinctively without thinking, such as switching hands, changing angles, removing the obstruction etc etc
If the answer is (d) then you are using sensitivity (basing your reaction on the tactile information received). In the split second of contact the first thing that tells you your punch has been stopped is the sensation from your arm. Understanding the correct / highest percentage response to such stimuli and reduction in the time taken to respond is either gained through years of experience of fighting and sparring or through sensitivity training or both.