There is always both present in the water and the substrate. If you follow any sort of fertilizer regime such as "Estimated Index", you are adding both at the same time. The questions is HOW MUCH. You use separate nutrients so you can measure how much of each you are adding. You want to maintain a certain nitrate level based on how quickly your plants use nitrogen. Same thing for phosphate, potassium and so forth. Minerals are usually lumped together because there is no way to test for each of them separately, and plants use minerals in much smaller amount than they do Macros. Mixing them does not matter, it is having too much of one and not enough of something else.
Robert Paul Hudson
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Kindness like love is unconditional