In short, Bitcoin isn't for everybody. The problem is that there are so many people who jump right into it without doing a quick due diligence. Especially during a bull run when Bitcoin is all over the news highlighting its price increase, many start buying without understanding anything.
One thing you're missing, however, is the responsibility that accompanies a Bitcoin investment. To invest in Bitcoin is to be your own bank. That requires you to at least understand how keeping Bitcoin is properly done. If you don't want to spend time and effort understanding wallets and private keys and whatnot, Bitcoin is also not for you.
On the contrary i think Bitcoin is for everyone, no one is restricted from not investing in bitcoin inasmuch as they have the discretionary income to invest with. The only due diligence anyone can do before investing in bitcoin is to understand market volatility and also to know how to safeguard their seed phrases and how to apply other security protective measures.
Buying bitcoin during bull run is not bad as it seems but what is important is how to be able to HODL for a long time as that is the only way you can get enough profits from your investment, the only strategy will be buying more during DIPs and buy lesser when the price is high. Anyone investing in bitcoin should know about ''not your key, not your coin'' which means that they should keep their private keys and seed phrases safe to avoid being compromised by someone else and should also understand that if they lost their security information, the coins will be gone forever.