You still rely on your cellphone and network. If Bitcoin becomes common enough, governments will find ways to ban / infiltrate / manipulate the network. It has already come down to seizing your land and gold, why don't they seize your phone, wallet, cut the Internet, arrest anyone who trade with Bitcoin?
Gold is good, but as a chemical engineer, nuclear chemistry is a real threat.
I love ETFs, but I think the market is artificially inflated by the current trump bull run.
Bitcoin is used worldwide and can be kept on a cellphone or piece of paper.