For a new investor, depositing Bitcoin using DCA method is the most convenient and very easy process. Using DCA method, you can buy at all levels.
It is very difficult for a middle-class person to buy DIP. They get money monthly or weekly and it is very difficult to survive for 1 month with the amount of money they get. In the middle of this, some investors save some money and buy every month or week and for them, buying using DCA method is the most convenient. And focus on keeping it for a long term like 3 to 4 circles.
Every investor buys Bitcoin according to their income and how much they're willing to spare into investing on Bitcoin be it daily, weekly or monthly. In the first place, investing on Bitcoin is a choice as well as how much one is willing to put into it on different intervals you don't expect someone to invest the majority of their income just cause the next man is using same amount for investment, that's why one have to invest according to what they're willing to spare, an amount that won't affect their daily expenditure.
For some that doesn't have money to do the lumpsum, it is most important to start with the DCA, it's for a class of investors and you'll definitely reach your target so far you have a steady cash flow to keep going for years, maybe the person can restrategise along the line when the get more money but for a start, every newbie whether rich or poor should start with the DCA strategy.