If a beginner, after he gets a profit thanks to luck, continues to trade, sooner or later he will lose not only the profit he received, but also the money that he originally had. Therefore, you should not rely solely on luck, it is necessary for a beginner to gain knowledge so that his trade becomes profitable.
I also agree with what you said that people who only rely on luck when they trade will not be able to survive in the market forever, because they will never know when their luck will run out, and even people who have knowledge and experience are not sure to get profit in the market. And therefore if someone wants to really do good trading in the market then they must be able to learn trading strategies well and manage their financial allocation - that is the only way that can be done by someone to be able to survive in the trading market.