What I think wrong for waiting for dip is people who use DCA method since this will delay their accumulation and they might commit wrong decision if they always thought about wait for a dip is best for them to do.
I don't think it's wrong for people who practice DCA to wait and buy the dip because that is also one of the buying strategy of a good bitcoin investor/HODLer. And also it will not affect their accumulation process since they have reserved fund to be able to buy weekly or monthly DCA, and buying the dip also. Though some people may prefer only the DCA while some will buy on each dip or lump sum as a single strategy, but the best strategy is Combining the 3 strategy. That will help you to accumulate a sizable amount and you will not miss any bit of the accumulation process. Emagine when you buy bitcoin when it dips, buy on weekly basis and buying at once through lum sum when you have an extra income aside your discretion. Don't you think it's surely a nice investment strategy?
I don't think so, if you want to invest for long term then do DCA then why wait for the dip? you can act know and start to accumulate. Since waiting for dip is actually no sense at all especially if you are for long term. I maybe understand a little bit if you are for lump sump strategy but it truly depends on you. What's important is you didn't waste your time waiting for those unforeseen circumstances since it will just create disappointment and that could lead to create some bad decision especially if you face huge down trend since it make people fear to acquire. That's why they should stick on their plans and focus on strategy that they are using. Thinking other things will stir up everything and might lead to major collapsed of our investment.
Although I understand people saying they should wait for the dip since they want to earn money. But for the fact that market is volatile then we cannot determine the exact dip we are waiting for. But overall it really depend on what people prefer and how deep their understanding towards what they are going since this will determine if they are going to gain profit in future or they slip away and decide to sell early because they can't handle the pressure also can't execute well those things they say.