I was explaining this to my daughter in quite simplified terms the other day- we evolved to taste sugar and enjoy it because finding a sweet edible plant meant we had a source of energy to help us hunt that day. Pretty useful if you’re a hunter-gatherer.
So we seek out sugar. Now we can get it whenever we want it, in much more massive quantities than we are supposed to be processing. Most of us are addicted. I’m not an exception.
Ya says who? Almost all sauces are made with a little sugar. It helps cut the acidity.
You don’t need to add a ton but to say you NEVER add sugar to sauce is ignorant.
Heat and time on the stove are the only 2 ingredients required to balance tomato acidity, not sugar.