For the same reason we have nerves anywhere else in the body: to signal, through pain, when something is wrong (infection, trauma, etc.) It used to be thought that people with leprosy had super human strength. But one day a doctor who lived in a leper colony to care for them asked a patient to get a stuck sink valve unstuck. The patient succeeded but the doctor noticed the patient's hand was bleeding afterwards. He came to understand that the patient did not have superhuman strength. What the patient did have was a reduced ability to perceive pain, because the patient's nerves were damaged by the leprosy. So, a healthy person would have stopped trying to turn that stuck valve because the pressure of the metal on their skin would hurt. But a patient with leprosy would keep going because they couldn't feel the metal damaging the tissues in their hand. Similarly, diabetics with poor blood sugar control eventually lose sensory nerve function in their lower extremities, and can suffer damage to their knee joints and the soft tissues of their feet without even realizing it.

Nerves offer us a feedback mechanism. Touch stove equals hot equals perceive pain equals pull hand away. If we lack this feedback mechanism, we damage ourselves. If we could not sense pressure and pain as we bite down, we would probably end up shattering our own teeth by biting down too hard, because there would be nothing signaling us to stop. Nerves are important! It's no fun when they signal the pain of a bad toothache, but ultimately they help protect us.

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When I got my first (hopefully only) root canal I asked the doctor basically this question. She said the nerve is most important when the tooth is growing and moving into place. After that it’s not nearly as important but sticks around anyway.

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Isn't there a problem with there not being enough beryllium to make more than a couple of large scale reactors?

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There have been designs for counter pressure spacesuits that keep the body under pressure from the tension built into the material of the suit. The head would be surrounded by a breathable atmosphere but the rest if the body would be in vacuum. Tests show they’d be quite effective.

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There was a project I saw in Alaska I believe that used low temp geothermal to drive a centrifugal compressor backwards to generate electricity. It was for a lodge that used a ton of fuel oil in the winter to heat and make electricity that now used lower temp underground heat. I found it again here

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Just a guess here but I would expect these nerves serve the same purpose of most nerves.... telling you when something is wrong.

Yes there is feeling, tasting, smelling etc but reaction to something wrong is common to all/most? nerves.

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As long as your body intakes normal air, and the atmosphere outside is the same pressure as our atmosphere, then I would think that nothing of significance would happen. Being submerged in water and having a breathing apparatus, but not a full diving suit is possible already, so long as the pressure differential isn't significant. Breathing pressurized air deep underwater and then rising up too quick is dangerous due to gas expansion, as well as nitrogen saturation. As for long term side effects, I don't believe it has been tested before in a study. Could be wrong on this though.