Probiotics do not feed bacteria, they are bacteria. SCFAs, butyrate, etc. are critical components for overall health, and especially in colon health and the normal functioning of apoptosis and other mechanisms. Prebiotic plant fiber feeds the healthy bacteria which produce those. Eating WFPB helps the healthy bacteria thrive and starve out the bad ones. Trying to intentionally repress the entire microbiome is a recipe for creating an opening for unhealthy bacteria to take over, while also depriving the body of healthy microbiome byproducts.