I think these are the disadvantages
1.Government cant control bitcoin so that many people consider it as illegal.
2.We cant use bitcoin everywhere because all shops doesnt accept bitcoin.
3.sometimes many exchange sites get hacked or scam so people stop using bitcoin.
Technically speaking neither of those are bitcoin disadvantages, your first point is just governments being greedy, the second is just the ignorance of people and their unwillingness to adopt bitcoin fast enough, and the third is the fault of private parties that give that service.