I believe that touch is the most important of the five senses. Many people may consider their sense of sight to be the most important. The loss of sight is a tragedy, but life goes on. The loss of hearing is just as bad, but you can always adjust. If you lose your sense of smell, you won’t be able to smell but again, you’ll get by. Lose your sense of taste and food will be flavorless but you can still get by. However, if you lose your sense of touch you will also lose your sense of pain. You could be harming your own body and not even know it because you can’t feel anything. Science has shown that touching is necessary for life.
I believe that taste is the least important of the five senses because in the scheme of things it really is and to lose it is to have the inability to detect sweet, sour, bitter, or salty substances. All other attributes, from its firmness, flakiness, temperature and texture are functions of other senses. The same goes for anything else we might put in our mouths. Any sensation which is not sweet, sour, bitter, or salty is not part of taste. Detailed flavors are part of smell and the feeling of presence in your mouth, the coolness, or heat, these are part of touch.
If I lost one of my senses, I think I would find ways to compensate for any gaps and learn to pick up things in other ways that the average person with all five senses might not. As far as losing your hearing goes, eyesight or other senses do not improve. If I lost my hearing, I would use my eyes to pick up clues as to what’s around me instead of depending on my ears to pick up sounds. I suspect that losing a sense would amplify another sense, but the ones you start depending on and using more become stronger with use. When your back is completely against the wall with no other options, you’ll find a way to survive.