As an example, peas themselves are likely very healthy, but pea extracts like protein powder and pea-based fake meats are likely not.
This reductionistic nutritional approach where we are trying to extract from a food the one compound that makes it healthy simply does not work.
The food has thousands of compounds, that interact with each other in thousands of different ways. It's not the fiber either, that is another reductionist view, it's the whole food.
Just take a bunch of veggies, put them in the microwave for 10 minutes without any water and add your favorite seasoning: balsamic vinegar, tahini, miso paste, something sweet, and eat the whole food as it comes from the grocery, as fresh as possible.
You can do this to carrots, onions, broccoli, potatoes, onions, garlic, eggplant, pumpkin, butternut squash, almost any vegetable will steam in the microwave without any added water.
You can do this to pears and apples also, they are delicious in the microwave. Add beans, lentils, seeds, oats with red fruits for breakfast, and you are good to go.
The move to consuming more plant-based foods is a step in the right direction in terms of public health, but I'm a bit afraid of the backlash that will inevitably come when studies start coming out saying that these highly processed plant foods are not exactly healthy either.