Really works but reckon that sometimes when you are in a haste to buy too early, you may just end up buying valueless coins when community poor demands may lead to death coin or even after a sudden pump could be dumped.
But if alert and being lucky as you buys once listed in the exchange, you could quickly swap to some potential coins instead of piling up as supply for demands.
What you said only applies to spot trading not to futures trading because the concept you said is a concept that is very common to most traders and even by traders who are still beginners because most of them trade in the spot section not in the futures section. But your advice in this case can also be useful for those who want to start trading more safely because if you don't have more knowledge about the market and the influences that can make the market change, it's better not to play in the futures market.