The crypto market is not static, the currencies rise up through volatility. It is better to enter the market when the price of the currencies decreases you need to analyze the current market situation. If the price of bitcoin has been going down for a few days then it may be a good time to buy sometimes the price can go down further so you can analyze the market carefully. In this method you buy a certain amount of bitcoin after a certain period of time so that the impact of market fluctuations is somewhat reduced this can be beneficial for long term investments.
Of course and this is one proof that investors also refer to various data before buying further. I think the advice you give is logical and worth considering. but I am not the type to rush into buying something.