The best thing in bitcoin is, I can save it in my own bank, blockchain, and get full control of it. We don't need the teal banks anymore, and don't let them take our money.
The disadvantage IMO, what will happen if internet get shut by some accident or disaster... I think there's no way out to recover our bitcoin once that happen
So if the internet get shut, the whole country will get many problems then. Not only affect us and our access to bitcoin, but also banks, the governments, online shop, public service, market, and many more.