It's generally advisable to take a long term perspective when investing in Bitcoin and focus on the fundamental of the technology and it's potential growths.
the decision to go for either what you call long term investment which is HODLing or short term investment which I feel you're referring to TRADING depends totally on the individuals choice and experience.
For people that have mastered the art of trading, they might look at buying the DIP end HODLing it as a strategy for the inexperience ones while those that only buy the DIP and HODL might think that traders are high risk takers but the thing is more of focusing on what works well with you and sticking with it. The only issue is that because of the complexity involved with trading and the chances of a new person just starting his Bitcoin journey to experience looses more in trading than he will do in just Buying the DIP and HODLing is the main reason why it is more advisable for a beginner to start his Bitcoin investment journey by just accumulating it and Hodl.
so perhaps if most investors especially the new ones on Bitcoin investment will be able to remove the spirit of greed and focus only on the future of Bitcoin there is every possibility that they will surely do well on there investment journey.