DCA is a method that helps you invest without any headache. The most important benefit of DCA is that it gives you enough time or opportunity to transform from a small investor to a big investor. If you can maintain consistency in DCA and its duration is either 8 years or more than 12 years, you can accumulate more bitcoins than you expected. I think DCA will be most effective for simply growing your portfolio.
DCA has many other benefits. For example, reducing market volatility, allowing for buying in all types of market conditions, allowing small or large series of purchases, taking projections according to your situation, etc. But all strategies have risks, including DCA. You must be long-term and ensure investment protection for DCA for good results. Even you need to have a proper plan.
DCA don't give a huge benefit to small investor to turn his money into big profit because if you have 1000 dollar and you are buying every week or at every dump of 2% with 100$ then you won't make any big difference and big profit because you might invest that money in a week with dump and pump percentage method and even if you chose time method then you might have a chance to make some profit but still transforming to big investor is not possible.
Only a Lump sum can make you a big investor with a small investment. The DCA method doesn't decrease market volatility, but it decreases the pressure of market volatility on you. I think English is not your first language, haha. Don't mind, please.
But I agree with you as DCA is good for any type of scenario in the market and without even a plan you can accumulate BTC over time with DCA so to make that accumulation profitable either we need plan or we need to wait for a long time.