Carbs and starches have TONS of nutrition....vegetables, fruits, nuts, seeds, herbs. Eating a diverse selection of plants is great for your gut and metabolism. Yes, there are "bad" carbs...highly processed grains/bread/white rice, deserts, sugar added and processed foods, all of these things can lead to glucose spikes and excessive insulin release, but carbs and starch in general aren't bad at all, and fiber is incredibly important for gut health, which ties in closely with balancing chemicals in our brains and hormones and overall immunity.
I'm about 95% plant based, plus eggs, yogurt and very, very rarely real meat Pretty much everything I eat is carbs, starch, low fat, and vegetable based protein, for the most part. I'm not saying that is what everyone should do, absolutely not, but it's a HUGE myth that to be successful and lose weight you have to do low carb or keto. The key is finding the right foods that your body processes the best and keeps your microbiome healthy.