Is Browning Meat Necessary

rather than a specific recipe, i’m wondering if browning meat before placing in a crock pot is really necessary. i never brown ground beef or chuck roast, but i wonder if the taste is different? we’re MOSTLY vegetarians so i’m not really experienced with cooking meat. but, my family does like certain things in the crockpot. browning is typically called for in recipes. is it really necessary for taste/appearance/quality??