For all the similar reasons you gave, except - no sugar, no energy. You may wonder why a skinny af cyclist will happily consume 6k+ calories a day, as well as shovelling glucose gels down. Endurance athletes get it best: long distance cycling is just an all-day eating competition.
Sugar is not an essential nutrient. You can eat absolutely no sugar without any ill effect. If you eat some starchy vegetables, that provides all the carbohydrates you need.
Even if you want to eat 6000 kcal as carbohydrates, you can eat that easily from rice/maize/bread/potatoes etc., with no sugar. In fact it is much easier to eat a huge amount of food when it does not contain sugar, because even if sugar is addictive and makes you crave for it, when you eat too much sugar during a short time, it becomes disgusting when you try to eat more.
On the other hand, if you stop eating salt, or even if you just eat too little salt, you will die soon, and not in a pleasant way (e.g. one of the symptoms of hyponatremia caused by eating too little salt is severe constipation, because various muscles, including the muscles that are used for the peristalsis of the intestines, lose their strength).
Like for any essential nutrient, both eating too little salt and eating to much salt is bad. The recommended daily intake of salt is between 4 and 5 grams of salt.
In order to be able to control precisely the daily intake of salt, I prefer to not add any salt to food during cooking (and I do not buy industrially made food). Instead of that, I add the salt only immediately prior to eating, so I can know exactly the amount added during a day.
One benefit of this, like you say, is you develop a general disgust for sweets and have no interest in them outside of training.
As you say, in order to achieve the maximum power output that can be sustained for a long time, i.e. in aerobic effort, you also need fructose, i.e. sugar, besides glucose, to reach the maximum rate of carbohydrate absorption in the intestine.
However the vast majority of the humans may never encounter during their entire lives a circumstance when they need to produce a sustained power output so high that it is limited by the intestinal absorption (and without an appropriate training their muscles would not be able to sustain so much power anyway), so they never need to eat sugar. They eat it only because it tastes good.
It is essential for strong stomach acid (a whole system benefit), your body always ensures the salt level in the blood (and will even extract it from bones). Ask yourself - 'what is the most common medical intervention' and you will see it is a saline drip. And farmers ensure that salt is available to the their cattle for their health. And Japanese have a highly salty diet and live long, with fewer bone breaks. And, and....
Salt is essential, and a low salt diet is terrible.
Then ask, why is a low salt diet recommended to people, if it is so good? The answer, sadly, is that the 'health' industry actually requires ill people - they make money treating disease, not from keeping people healthy. It is in the big pharma's interests to encourage poor behaviour, and, yes, they will even lobby governments to mandate behaviour that creates disease.