OK... I made a list of the common issues. Here it is:
1. Hacking of wallets
2. Lack of legal clarity
3. Tax complications
4. Volatility
5. Transaction fee uncertainity
indeed sir. these exactly are the problems that we should pay our attention. these 5 are so simple when you look at them but very huge effect if one of these happen to you, we must be very careful and take good care of our accounts.