Waiting for a price drop to start investing is the biggest mistake a person can make and makes him lazy. He even gives in to procrastination and misses out on market opportunities. By waiting for a price drop or dip, you will only miss out on buying opportunities and delay reaching your goals or you will not be able to start your journey towards your goals. It is still better to start investing and be consistent in any market situation without focusing on the market, even better for you if you can ignore the price list and focus yourself on consistent buying.
It actually depends a bit on where you expect the price to be. With Bitcoin at $80k, it might make sense to wait for $78k. You can wait for a few days for this. But if you are waiting for $7k, you will wait a long time.
From this perspective, realistic expectations have a point. But for small gains you can also lose a bigger gain. Not everyone should take this risk. In my opinion, Bitcoin can be bought at any price. There is no expensive Bitcoin. Because every time Bitcoin is breaking its record.