Instability is a huge drawback. You never know what will happen tomorrow. Unfortunately.
If that was such a huge drawback then no one will invest in the stock market, real estate or gold and yet most of the money around the world is invested in those three things, besides if it was such a drawback as you said then it will be impossible for us to make as much money as we are making, remember we cannot have a stable currency and a great investment in a single asset.