I will not agree with you completely on this because what I do know is that the method chosen for entry depends on a lot of factors and particularly on the personality of the investor. In other words, many things can constrain an individual to use certain method to buy. For instance, someone who just knew about Bitcoin investing and sees the opportunity it holds can decide to make it one of his retirement plans hence, decide to stash his wealth in Bitcoin. Such individual might feel that it is unnecessary to be checking the market weekly or monthly when he plan to hold for several years, in this case, he can comfortably use lump sum buy or even buying the dips to collect those Bitcoin. Although the DCA method seems to be better for new investors since it is systematic and helps with the management of the psychological aspect, this might be the reason for your point but it does not take away what I earlier said. Remember we cannot force everyone to use one method to buy rather we can only make suggestions base on our experiences and those of others, and leave it to the individuals to decide what gives them the peace of mind and help them achieve their targets.