Investing in Bitcoin is not risk free especially to investors who do not invest appropriately with the right approach and strategy, and also not sticking to their investment plans (long-term).
I disagree with your statement partly because long term investing is not risk free. Investing in Bitcoin or other coins certainly involves risk. If you are a professional investor then you are used to taking risks as the price of any currency is not always the same and fluctuates constantly.
Also, Investments are tougher in other assets I've known, but with Bitcoin and a few other altcoins, they are cheap, which is an advantage. With a little learning, one can start managerially, which is why I encourage everyone to always go for them and override the little risk involved with a bold mind and the right managerial calculations.
I understand what you are saying about investment being tougher on other assets, because in other assets one has to deal with several regulations/approval which are time consuming and capital intensive. But on the other hand bitcoin investment can be started right in your room within few minutes and without anyone knowing. The only thing I find worrisome about your post is when you made mention of altcoins along side bitcoin. You know there are a lot of atrocities going on in the name of altcoins. Many scams and rug pulls happening with altcoins, people have lost their hard earned money repeatedly that's why we don't encourage people to venture into it. Bitcoin is the real deal and anything other than bitcoin should be avoided completely. You will notice that some regular users of this thread have quoted you on about this altcoins of a thing you made mention of because here we value what we feed the audience and we we don't want newbies and others to be mislead, that's why any thing other than bitcoin is not encouraged here. And if you have been doing it on your own, you should refrain from it so you don't get hurt or be a victim of it yourself.