A problem with the SCD diet is that it is severely lacking in calories and you see many threads of people losing weight on it.
Staple foods in the West and Asia are all carb based, because it's what humans are able to easily digest and turn into energy.
Potatoes, rice, pasta (noodles), bread, cornflakes. Those are the staple foods where people get their energy from.
Yet the SCD does not allow people to eat any of them.
The SCD diet removes all sources of bioavailable calories.
So where exactly are you going to get your calories from. The only other source of energy is fat, and fat is very hard to break down, incredibly harsh on the intestinal lining and the few people that do try those high fat diets (the ''keto'' diets) do it because they lose weight on it, and they need to take lots of enzyme supplements to be able to digest so much (unhealthy) fats, otherwise they would be on the toilet all day.
I think it's fine to eat some more of this or that, but the SCD diet tells people to completely take out staple foods, the main sources of calories around the world. I have a really hard time saying anything positive about this diet.
If you don't like potatoes, eat some rice, if you don't like bread, eat cornflakes, but you can't just remove all staple foods, SCD leaves people with little to no option to get their daily energy needs. It is far too lacking in calories.