Agree with you. It is natural for investors to have differences as not everyone has the same mindset. But some investors who don't understand at first but realize it later. Bitcoin trading is not safe but there is an increased chance of losing money due to its volatility. But if a small amount of Bitcoin can be held regularly then it can definitely be a great asset. However, it can be difficult for those who are looking for a way to collect bitcoins for passive income from bitcoins because there are no areas where there is any way to earn passive income through bitcoins. Bitcoin's value has steadily increased since its inception and this trend continues. That's why holding Bitcoin is definitely profitable. But surely an investor should not only consider the profit but also consider its positive and negative aspects and then invest.
He should also know how much he is qualified
You don't even need any qualification to be able to hold bitcoin. Bitcoin long term hold is open to everyone. The only thing needed is to have your money for investment. Aside this there is no other qualifications needed. Buy your bitcoin according to how you have programmed your DCA frequencies.
or capable of long-term investment.
So what happens if he thinks he is not capable for long term investment? Should he then go for trading instead? For me all investors are capable of long term bitcoin investment. It's just about your mindset and your determination to hold bitcoin for a long time, at least 4 years. Bitcoin wasn't designed for some people to be capable of holding, while others are not. Bitcoin gave everyone a level playing ground. Wether you see yourself as being capable or not, is your decision alone.