If OP and everyone has ever heard stories about someone getting rich, someone making huge profits or becoming a millionaire through crypto, then most of those people are long term investors. I have never heard of anyone getting rich or becoming a millionaire through trading or staking.
They can get rich with altcoins, meme coins, airdrops but I agree with you that getting rich through long term investment into Bitcoin or very strong altcoins like Ethereum is more sustainable wealth. First it is a good method to build wealth. Second, risk of free fall from Bitcoin is very smaller than altcoins. Lastly, if people have habits to chase greed games with meme coins, soon they will lose big money to meme coins.
Long term investment may be considered the safest and best way when it comes to the crypto market but many newbies don't understand that and they get caught up in things that generate short term profits like trading.
Everyone has instinct of human, to be greed but very few people can be knowledgeable, have enough experience and control their psychology well enough to avoid easy-to-lose games like meme tokens through investment or trading.
Your advice is accurate but newbies will have to learn, experience and pay expensive cost to understand it.