That's while i always emphasis that Bitcoin is not something a good investor will wait until when the bottom will reach before buying a cryptocurrency for long investment, it's very obvious that cryptocurrency investment doesn't have a specific bottom because if we should be waiting for the bottom before we can invest for long run.
You have a point because any price Bitcoin is bought in this current market or below the ATH price is a good investment but there's nothing bad in waiting for the bottom price either to maximize profit-making chance since from the last 2 months of the bearish market year till the first 2 months of the next year are always the time where the bottom price is achieved.
With that being said. What matters is the decision made during the opportunity the market presented.