You are right, indeed anyone can make a profit from trading as long as they have good skills and knowledge about trading and choosing to invest Bitcoin in the short term is highly discouraged because the price of Bitcoin is very volatile so this will be very unlikely to be able to generate profits in the short term, but it would be great if we continue to accumulate Bitcoin assets and hold them for a long time to be able to make a profit from holding these assets and we also have to keep planning before deciding to start in order to be able to run the investment properly, as you said it is very right we have to think about emergency funds so as not to interfere with the assets that we have invested when we suddenly need the funds
To me short-term investment ain't encouraging at all the risk in it alone is too much compare to that of long-term investment. Like for instance someone that lacks the ability to be patient (because I believe short-term investors are really impatient) , and endup buying bitcoin at the peak and then a massive dip followed it , that individual won't have the mindset to keep buying and holding instead he or she will endup selling in loss because they lack the patient, thinking he or she has cut their losses.
But for those that are into long-term investment, instead of selling in loss they will continue to buy the dip , because they believe in a long run they will endup with the last laugh , so they will keep accumulating and holding , and if later on the price's endup risen (surging) they will endup with a far better profits.