When someone understands enough how the market works, then of course they can take advantage of any momentum to generate profits. You don't have to trade every day to make a profit, but you have to be able to do analysis enough so that you can make a profit when trading.
We are all aware that sometimes price movements do not always match our expectations, but good analysis can usually help traders to get commensurate results. The saying you say is true, but there are always different strategies that can also generate profits. Rumors are not always true, but some rumors can come true so there is no harm in taking advantage of such things to gain profits from trading.
It seems easier to recognize the trend on the global chart, but for day trading everything is too volatile and it is really difficult to count on daily profits. From time to time, Bitcoin was in a flat and during such periods it was convenient to trade it even on day trading, but when significant movements begin, this complicates everything. In any case, trading Bitcoin seems safe to me, if you are trading on spot trading then you should not worry that you can stay in this position for a long time.