I also thought more modern research on salt is more nuanced than 'salt is bad for you'. I think the newer understanding is that salt is only bad for people who are 'salt sensitive', in which case it increases blood pressure. Many people's blood pressure is not affected by salt, and there does not seem to be a negative effect for those people.
That's certainly a much better proxy than fat or sodium, from what I understand.
I'm actively trying to cut sugar (and carbohydrates in general, but especially sugar), and have already noticed I feel a lot better. I don't know if it's actually contributing to weight loss, but not feeling completely worn out after eating a big meal is a benefit in and of itself.
One thing that makes it difficult is how much sugar is in everything (even in things that you'd think shouldn't need it, like jerky). Pork rinds have been a godsend for properly-carb-free snacking.
https://www.healthline.com/nutrition/is-salt-bad-for-you