You are right. If a person has the right knowledge, the right knowledge of the strategy inside him, then he will never be afraid of the market going up and down. Since he has the ability to analyze the market completely, he can analyze it correctly with his maximum knowledge and invest correctly for a short time or a long time. Although he loses some amount of his money, he has the right knowledge and ideas to recover his money. So I think for a professional investor, no matter what the market is like, he will not be afraid of being in the market, but he can continue to invest with his own knowledge.
I feel it is wrong to think that someone has the prowess to be able speculate the market correctly, infact nobody has the ability to analyse the market movement correctly. Also I believe it is mostly traders and those that are looking for or waiting for a desire dips that will always go through the process of analysing the market before they start accumulating.Those that are investing in bitcoin for longer term purposes don't have this mindset of always wanting to analyse market as to know whether it is to enter or not. All one needs to know is to sort out there discretionary income, once they are able to do this the next thing is to start accumulating instead of waiting and analysing the market at the same time missing market opportunities.
Sure i agreed with on these that no one has the ability or power to be able to predict the market correctly, at such it is always advisable for any investors that have discretionary income to investment should start now because waiting to analyze market before investing fully, and which can make such investor to practice trading his Bitcoin instead of going for long term investment.