Even after reading this post, all I can advise everyone is to still invest what they can afford to lose!. Do not think that just because Bitcoin has done well over the years we should neglect risk management. I think of investment in a way that once I've put my money in there, I have lost it (just to keep myself from being too anxious and always checking). I have lost quite some amount of money in crypto, and for the times that it happened, I never felt shocked cause I always acknowledged that I could lose it all. So, investment as a whole is a risk and one should be risk-conscious when being a part of any investment (be it Bitcoin or not.)
Not only with bitcoin and with any investment, once it can bring profit, it can also create risks for us. So I still maintain my opinion, let's only invest what we can lose.
You're right, just because bitcoin has done well for many years doesn't mean it's risk-free or absolutely safe. Even gold and real estate are not absolutely safe, so with an asset like bitcoin that is only 15 years old, nothing is certain. Don't be too subjective with bitcoin because the future is unpredictable.