I don't buy that idea that trading can be used to increase your bitcoin portfolio. Trading will only distract you from increasing your bitcoin portfolio, because as long as you believe in that whimpy idea of increasing your bitcoin through trading, you must always trade, even when you are making loss. Trading is like gambling, whereby you have the mindset of making money from gambling, you will end up chasing your loss and losing more. If I have $100 like you said, and I didn't trade with any fraction, I will make more profit in the long term compared to someone that traded with a fraction from his $100. We are talking on how to increase our bitcoin portfolio and not on how to reduce it and only DCA method is more efficient. A trader reduces his bitcoin investment and is expose to higher loss than an hodler, who uses DCA regularly.
DCA has been the best method reiterated to be used to increase your bitcoin holding amidst the high volatile nature of the market. If we all want the bitcoin price to go as low as we wanted to have an entry point, many will never get to invest in bitcoin and its increasing holders will not increase over time. Trading is seen as the best strategy for mostly gamblers. Those that are already exposed to gambling for a long time when coming into bitcoin investment they will prioritize trading over holding which is not a good way for a newbie into bitcoin to go for. A trader is always exposed to risk and can lose all of their investment by taking a very wrong step. The best method still remains to hold as it reduces the risk of losing your money and increase your hope of a better profit in the future.
The point you are making here is not to sell out of panic so that we don't feel the loss because 1 bitcoin is still 1 bitcoin right? and you say it's not risky at all? Indeed, at first glance there is nothing wrong with that, but do we think that we have to hold longer than we should? in my opinion it is a consequence of the risks we take. Isn't that a very closely related thing? So in general I disagree with what you're saying.
On the contrary, I agree that when we do not sell panic when the price drops far from the price we bought then we cannot be said to have lost because we still hold the same amount of bitcoin.
Bitcoin is called a risky asset because of its volatile nature and that is why, one needs to invest with only the amount that he can afford to lose, so that if bitcoin price goes below his entry point, he can just ignore the price and keep on hodli. That is why it is advisable not to borrow money to invest in bitcoin so that you don't end up selling when it isn't your will, to avoid loss.
The Fear of missing out (FOMO) has made many people to go into debts and ultimately forced to exit the market when it is not yet time to reap the profit of their investment. It is good to have an early investment in bitcoin when the price is still low but no one has ever had a peace of mind and sense of profiting while using other people’s money or loaned money to invest in bitcoin. The volatility nature will make you lose hope as early because of the fact that you’re using a money that is not yours. You will be forced to exit the market not to burst people’s money before you even get the profit that will come in the long run. With bitcoin you’re safe but with altcoin you’re just gambling and might not profit you in the future.