I think the primary function of bitcoin is to give freedom to everyone to earn extra income without control of the government and banks. Also it could help us to have an easy and quick payment system through cryptocurrency. You don't need to go anywhere to pay your bills or buy some goods if you have bitcoin yoy can always use it even you just setting on your chair at your house.
Indeed, what you say is true, the function of bitcoin gives the freedom of every user, without the control of the government and the bank. This makes time and costs more efficient and fast. Bitcoin deserves to be maintained because it has superior and fast-developing functions.