If you eat a whole-foods diet, you'll get a lot less salt than you would with manufactured foods. (I think the target is 5000g a day, IIRC.) A minority of the population is salt-sensitive--maybe 25%. I don't use common table salt with additives, but I take Iodorx tablets or swab some iodine on my skin occasionally.
Yes--we need fat. And saturated fat is one of the healthiest kinds--if you look at its chemical makeup, you'll see that it's very stable. And humans have thrived on it forever. It's the highly processed industrial seed oils, along with transfats, that are problematic.
I always said they probably serve unseasoned food in hell...
There are all kinds of books that promote anti-inflammatory regimes, from vegan to carnivore. Whole 30 and Wahl's Protocol are two. You shouldn't resign yourself to flavorless food. Bleah.