I have a different perspective! I even wrote a whole post about it in detail in the keto community (just now).
Carbohydrates are necessary, but not sufficient to develop type 2 diabetes.
i.e. it's not possible to develop type 2 diabetes without carbohydrates, I haven't seen any case study, or literature demonstrating it.
Obesity (as with all manifestations of poor metabolic health) is driven by carbohydrate consumption (driving insulin, driving anabolism). At least in this model [Paper] The Carbohydrate-Insulin Model of Obesity - Beyond “Calories In, Calories Out” - 2018