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This is just the point buddy, don't just wait for the dip before buying, keep on buying and if in the process of buying the dip comes, see it as an opportunity to accumulate more Bitcoin at a cheaper rate, not by waiting for it which might made the said fellow to miss a whole lot of buying opportunities during those period of waiting.
Furthermore, this current price of Bitcoin might be a dip buying in few years time from now so the best thing is to buy now that it's still very cheap comparing to how much it might get up to in the future.
What you said is true because as long as we have the ability to continue buying Bitcoin at any price, then it's better not to delay and immediately make a purchase, especially if it is to be saved as a future investment. So in such a case, of course there is no reason to stop buying or waiting for the price of Bitcoin to drop, because as long as there is the ability to make Bitcoin purchases at a certain time, then do it immediately without having to worry because Bitcoin still has the potential to continue flying high in each cycle.
But if you have seen someone waiting just to make a Bitcoin purchase when the price drops, maybe that person is not a Bitcoin investor but only a trader who is still not brave enough to hold Bitcoin in the long term. So everyone can actually easily distinguish it through the way someone buys Bitcoin. Because investors who like to store Bitcoin for the long term will not think too often about reselling the Bitcoin they have bought at any time.