It is very true that Bitcoin has some disadvantages, but you should also understand that there nothing that does not have disadvantages. The disadvantages of bitcoin are what makes it unique. We just need to accept the flaws of Bitcoin and try to understand these flaws in order to take full advantage of Bitcoin in terms of building a decentralized financial ecosystem.
Disadvantage is the risk and volatility, the lack of notification and understanding, with incomplete functions, but which are developing, so Bitcoin is not perfect.
Yes, Bitcoin is not perfect. You should also understand that nothing is actually perfect in this ecosystem we find ourselves. We don't need bitcoin to be perfect.