Yes, processed sugar is crap, but whole food carbs are not. People who eat mostly whole food plant based diets, in long term studies live the longest and are healthier. And why do people accept processed carbs to be bad but skip the same logic for oils (yeah, squeezed oil is processed food and also pretty much empty calories).
I experimented with a lot of things during my life, one of which was keto diet. I tried it several times for months, but always abandoned it for several reasons. Firstly, I feel like I loose 20+ IQ points on it, I can not think clearly, have brain fog, and after strenuous exercise, I start to forget things. And no, it was not a transitional period, it was the same after 1+ months and I tested ketosis with urine sticks. And it is understandable because brain is the largest consummator of glucose. Second, you do not have the same amount of energy, especially for burst activity. Third, you stink more, my sweat stink more, and breath also (which is kind of normal for keto). And lastly, it is harder to maintain which is not a problem for me if I found it to be beneficial, but it could be problem for many. And one more thing, each time I tried keto, I got sick during the period. It could be coincidence, but probably not.
Now I eat plant based whole food diet. And from all the things I have tried, it thicks all the good boxes. Eating plenty of very tasty foods, never hungry, never have sweets cravings, tons of energy (my libido went through the roof too), extremely easy to loose excess fat (while feeling good during the process), very good workouts and recovery and steady mental energy throughout the day, stool is regular and good, sleep better (and need less of it) and am much happier (yeah, carbs are precursor to serotonin, and fiber feed the gut microbiome which is extremely important for many things and most of serotonin is made in the gut also) etc. And tons of research which supports the benefits of it for longevity, health and sports.
Still it boggles my mind that we somehow managed to vilify foods like a sweet potato or brown rice or whichever carb containing food. I think Pollan summarised it the best : "Eat food (food=unprocessed whole food stuff). Not too much. Mostly plants." That would give 95% of benefits to most people. We get bogged down with details and minute optimisations while loosing the sight of the big picture.