Most plant compounds people eat for the health benefit are bound to sugars the gut absorbs poorly. Raw, you pass most of them. Fermentation runs the conversion step first, so more of what you add to the bag actually reaches your blood.
Most home ferment recipes assume you can take a crock-style spice blend and bag it. You can’t. The bag changes which aromatics survive, which get wasted, and which the bacteria actually use to build flavour.
Three Field Notes covered the variables. This one is the protocol that uses all three. The Neutral Base Method, every step from raw cabbage to refrigerated jar.