Keeping money in the bank and keeping money in Bitcoin are never the same, if you keep money in the bank you may get much less interest, but your money will never decrease,
Surely that is a typical lie. Keeping money in the bank does not guaranteed your money not to decrease. Your money can increase or decrease depending upon the purpose you requested in the bank. A fixed deposit account and savings account are not thesame thing because if you have your money in the Bank on savings, there is no possible annual return rather you will be charged Sms fee and bank maintenance fee. If will be deducted deducted each month till your money will reduce. Let me not go further, I don't discourage you from banking but dont compare bank to Bitcoin Because bank can not yeald a tangible percentage ratio monthly or yearly. Even though surely Bitcoin volatile nature makes it to be unstable where the price is not stable, but it is still preferable than keeping it in fiat that is affected by inflation and unnecessary fees. In another way keeping your fund in the bank is not investment. but buying Bitcoin and hodling is investment. A person who combines all the the three investment strategy to buy Bitcoin for 10years and a person that saves money in the bank for 10years are surely not thesame in terms of profit outcome.
That is why it is better to keep important money in the bank,
Money in the bank can be considered as discretion which can be used to settle imidiate and future want or problems. Can also be used for bitcoin investment.
and since Bitcoin is unpredictable and Bitcoin never guarantees profit, that is why you must invest Bitcoin with money that you will not need for at least 8 to 10 years.
I think you are misguided or lost here. How can you say Bitcoin does not guarantee profit and yet you say it can be invested 8-10years . If it was not as profitable as that, then why investing for that number of years?
Because you/we do not know for sure whether Bitcoin will actually be valuable in the future, we can only guess the possibility, and you should never risk important money based on guesses.
Even a blind man can tell you how important Bitcoin is and will be in the future. Sometimes the means justifys the end. Bitcoin has done pretty well for over 15years and you are still doubtful about tfhee future, then you don't know what Bitcoin is. I guess by trhe time yiu will know what Bitcoin is it may be too late for you.