Jay's opinion is the best at the moment to encourage us to invest wisely, because investing without knowledge and also having a target is just a gambling activity.
why is the DCA concept highly recommended to every bitcoin investor because that way you have full control over the money you make, for example every month you make $1k from the work or business you do and you invest $300 or $400 every month to buy bitcoin, so you still have around 65% of the money you earn left, you can use it for your daily needs and set aside a little for your emergency fund, however, this emergency fund is what you can use later for urgent expenses, so you don't sell Bitcoin that you invested so far.
Here is Bitcoin DCA calculator
https://dcabtc.com/ that tells how much you will earn if you accumulate Bitcoin in DCA manner for specific period of time. For instance, if we invest 10$ in bitcoin on weekly basis for last one year then after one year we will get
6.52% profit. While investing 10 dollars in bitcoin on weekly basis for last 2 years will give you
-11.15 loss.
Based on this calculations one can figure out how effective DCA can be. May be we can add some other strategy with DCA to lessen the risk involved.