Can’t say about others, but with cumin it makes a huge difference. But, again, we use ground fresh toasted cumin as is, usually sprinkled on the top of dishes.

Can’t say about others, but with cumin it makes a huge difference. But, again, we use ground fresh toasted cumin as is, usually sprinkled on the top of dishes. While, regular cumin is cooked with oil/ghee. Cooking toasted cumin will char/burn it.