Short term investing is like trading, but there is risk involved in investing for a short period of time. However, having funds is the most important thing when it comes to investing. If you don't have funds, you can't invest. If you have enough funds, you can invest some amount from there. When you invest you may face loss due to volatility in the market but if you have funds at that time then you can reinvest and get profit from it. So I also think it is very important to have an emergency fund to sustain the investment and an investor has a high expectation of profit in it. But long term investment is best as compared to short term placement and profit is easy here.
An investor will never make an investment based on your information, so I do not agree with such information, because the DCA method leads all investors to success and controls the price of buying Bitcoin. An investor if he invests according to DCA method he will never face crowd in any market if he holds for a long time. Both new and old investors can follow the DCA method, but success is possible if you keep it for a long time.
Not all investors are hoarding money, especially those who have poor holders who can basically DCA Bitcoin by saving extra money from weekly or monthly expenses. So the DCA method is open to any investor using it with the highest number of successes.