Let me be clear: I don’t believe in instant confidence as a permanent cure for confidence issues. I think what works in the long run is changing the thinking patterns and belief system which feed insecurities. And this cannot be done in an instant. It take times and persistent action.
I do however believe there are often situations when you don’t have the time to build confidence by addressing the roots and you need an instant boost for your confidence. There are strategies for this, which work a lot like a patch over a wound, with a temporary but also positive effect. This is why from my perspective, this discussion makes sense.