There is of course substantial variability in individual patient response to treatments. But a high-carb diet is unlikely to work out well for someone who is already insulin resistant. If that's the only diet that they can live with then their life is likely to be drastically shortened.
As for plant based versus animal based diets, we don't have any high quality RCTs to indicate that one or the other has a different impact on insulin resistance (assuming the same macros). So that's unlikely to be directly relevant for most patients, except to the extent that it impacts ease of living permanently maintaining carb restriction.
Sure but 1) there are many of us who are helped by WFPB and 2) Whole Foods plant based != plant based. High carbs was just my paraphrasing of what we do - lots of greens, lots of raw, elimination of meat, oil and sugar. And a bunch of other things. And while it helps reverse a few things, I agree it may not work in some or many scenarios.
I'm WFPB (plus salmon and eggs) myself. I grew up as a vegetarian and the carnivore diet is too unpalatable to me, even though it would probably work. WFPB can work to stave off T2D, but at least for me, I have to be vigilant about my choices and always pair carbs with proteins and fats.
My philosophy is that many diets work, you just can not have a cocktail. Our body is not a hybrid car. It takes time to switch/
Choose what you can live with - high carb, low carb, keto - and stay focused.