Another important thing is that the investment is largely risk-free and you should invest the amount that you can afford to lose.
This statement from you is confusing.
Bitcoin is not risk free.
The advise about investing an amount that you "can afford to lose" is advice given to show that the investment (including an investment in bitcoin) could go to zero, so when you invest, you are choosing to invest into bitcoin from extra money that you have, and you are aware that you could lose up to 100% of your investment amount.
I think I understand what you mean. I actually meant to say that Bitcoin is a safe investment where investors can be safe and risk free compared to other investments if they are inclined to save for the long term. What you are suggesting is to accumulate Bitcoin from excess/discretionary income and have a long term savings period which can be 4-10 years or more.
If an investor does Bitcoin in this way he will be financially risk free that is what I meant. Investment is risk free from the point of view where one uses his money to the extent that he could have spent extra/discretionary income. We mostly know that the value of Bitcoin will never go to zero but as an investor we should be prepared to refrain from using all our assets in investments or not being overly emotional. Saving in proportion to income and accumulating Bitcoin for many years. Having a large amount of backup fund and not missing the bearish season Bitcoin lump sum event.