The best time to buy Bitcoin was yesterday and another best time to buy Bitcoin is today. Any investor that has discretionary income readily available to invest in Bitcoin, but choose to start accumulating Bitcoin when Bitcoin is in a dip, just know that investor is not ready to invest in Bitcoin, because i don't know why people will want to start accumulating Bitcoin in a price that's not realistic. Just as you said, it is better for people who think that Bitcoin is too high for them to accumulate to start accumulating Bitcoin by DCAing because they stand a good chance of accumulating good quantity of Bitcoin, and if a dip occur, they can still accumulating Bitcoin, which is a bonus to them.
The truth is dips always sound easier in theory than in practice. When the price falls, fear usually grows, and many of the same people who said they were waiting for a dip still hesitate to act. That’s why building a habit through DCA is more reliable because it takes emotion out of the process. If the market gives you lower prices, you benefit by adding more, but if not, you’re still moving forward instead of standing on the sidelines.