Whether you buy the dip, or you DCA.. or you HODL ... or you do some variation of that, if your investment timeline is 4-10 years or longer, you are likely coming across more cash during that time and you are likely witnessing a decent amount of BTC price volatility along the way.. so yeah, if you are able to figure out when and where the dips are, then you are likely going to be better off by being able to time the buying of BTC during the various dips.. yet it seems to me that figuring out the dips and getting it right is not an easy task, so any of us who are in bitcoin for a decent amount of time and are continuing to add to our position with the passage of time, we are likely going to realize that sometimes we are just throwing up our hands and just sucking it up.. and buying at whatever price because we are having difficulties figuring out whether the BTC price is going to dip more and also we might well be able to see that we are accumulating cash with the passage of time and we would rather store some of that cash in bitcoin rather than continuing to hold it in cash and waiting for a dip that may or may not come.
Your insights about difficulties of timing the market and accurately predicting the dips in Bitcoin price are accurate. It is true that investing in Bitcoin is a long term game to make your investment profitable. It is also important to have a well thought out plan that aligns with your investment goals and risk tolerance. Dollar cost average (DCA) is a popular strategy to mitigate the impact of market volatility but we should keep in mind that no investment strategy is entirely fool proof and there are always risk involved with investment.