Why flush with deficiency?

So I just diagnosed a calcium deficiency in one of my plants. Upon doing a little research, many places said to flush soil and then add missing nutes. I'm more than happy to simply follow directions with something I don't fully understand. But my question is why flush with deficiency? I absolutely understand flushing with excess and lockout and had to do that on my first grow right before this. But it just seems to me that with a deficiency, nutes should just be able to be added to the soil.
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Wondering if anyone can explain why flushing with deficiency is beneficial. Or if they think it is beneficial at all.

I think the idea would be to remove any imbalance in the soil and then replenish with nutes and the calcium etc to give the soil a kind of balance of all nutrients again.

Personally I wouldn’t flush if it were me and I would just add what I needed to but then I’m a coco guy anyway lol.

jondamon said:

I think the idea would be to remove any imbalance in the soil and then replenish with nutes and the calcium etc to give the soil a kind of balance of all nutrients again.

Personally I wouldn’t flush if it were me and I would just add what I needed to but then I’m a coco guy anyway lol.

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Ah, that makes sense. It sounds like a failsafe. I don't mind a little risk here and there, Ill try to add what's needed.