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DCA is a trick to make people better, but it's just a trick.
DCA is a method to spread volatility risk over time. It makes extra sense if you have a salary in fiat and/or you don't have that 100k right now, for example because you still need to earn it - like most people. Taking out a loan and buying the 1 BTC now is a gambler move: DCA is a much safer strategy.
If you're living off sats and your income is in sats (or you're filthy rich), then it makes no sense whatsoever - agreed.