Pre-fertilised soils carry enough nutrients for the first few weeks (often around 3–4, depending on the mix and pot size). After that, plants in a normal mix start to fade, usually with pale lower leaves. Good living soil with enough compost can carry plants much further, but even there many growers top-dress or add a bloom feed in flower.
Coco and hydro are basically empty, so everything has to come from your nutrients. If you want the low-feeding route, a proper living soil is the way to start.
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