Chris, good discussion. There are going to be a lot of individual deals, here. Since we don’t need carbs, I’d say the distinction between ‘good’ and ‘bad’ is muted somewhat. I agree with Ken @240lbfatloss - if you’re not eating enough to mess you up, then it doesn’t much matter.
For some people, that may be practically zero, or it may be a substantial amount, but not too often. A separate thing is the question of what else is in the food - nutrients, additives, etc. I have to also agree that it’s better for me to eat a bunch of spinach than an Oreo. 
If we’re talking about “sabotaging ourselves,” I think it’s often a mental/emotional thing, rather than just physical effects, i.e. for many of us there are some really slippery slopes out there, whether the trigger is a cookie or a sweet potato.
You’re at maintenance and seem pretty darn level-headed about all this. I think you’re on the right track about less processed food, added sugar, fructose, seed oils and lower glycemic indices.
“General nutritional rule” - when I read about fiber, there’s often a good case for it, i.e. its effect as it goes through the digestive tract, that it feeds beneficial bacteria, etc. In practice, lots of us don’t worry about it and get along fine on a keto diet without much fiber at all. Personally, I only notice it if I eat a LOT of cheese, like a kilogram or 2 lbs in a day, and not much else.
It certainly is… 
lol