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I don't know if anyone else has different opinion about it?
Different opinion? I bet no reasonable opinion can be contrary to the DCA investment approach, the only suggestion here will be another investment approach and not the condemnation of the DCA approach as the approach is not the only way out in investment. Aside from this, DCA is a very good investment approach that fits in for the poor, average and the rich, it helps you average both your risk and earning possibilities. Mind you, with this approach, you should know that you would rather be conservative, so the aggressive investors or the most lucky ones might gain more than you, but still, you will average the pains of the bad market behaviours and also average the benefits of the good market behaviours which make the DCA approach unique because either way, you will never miss out.
I quite agree with you EarnOnVictor on the fact that DCA is not the only investment approach but among the most popular Nd cost friendly approach to bitcoin investment, and the most suitable for small and avarage guys who just have limited cash flow, this helps them to make the best use of the limited funds in they disposal to access the best possible quintity evaluation and accumulation of bitcoin and for a reasonable means, that can not effect the investor general well being, most times those that take this approach are the average money earners who may have no availability of funds to buy bitcoin at once and in large quantities.
DCA have helped majority's of forum members who started their bitcoin investment journey from stretch to this very point in time, and for sure we should be able to properly managed ourselves in other to be able to build a portfolio that follow an achievable investment goal and in doing that choosing the right tool to arrive at that destination is most important.
For a start and as a limited funds holder, choosing DCA approach, is most important and best approach to follow when you have limited chances of attaining your bitcoin goal both for the long term and the short term goals, so choosing the most simple DCa formula is the most appealing tool for those in such situations and times.