[WookieRushing]

No, cryptocurrency cannot be used as a normal currency. Nothing as easy as handing cash to someone else exists in cryptocurrency.

There's one giant benefit of using cryptocurrency and a few smaller niches. It is a currency of last resort to guard against hyperinflation or currency controls or for drugs. You should really only be using it if you can't turn your money into dollars but can earn cryptocurrency another way.

Check out an example like https://mission.org/hidden-in-plain-sight/bitcoin-a-lifeline... . In this case its easier to earn crypto as payment for doing work online than it is to be paid in USD.

The smaller niches include things like flash loans

Flash loans are actually new thing in the world but still pretty dangerous. You can get a massive massive loan (Think $1 billion) without putting anything down as long as you pay it back in the same transaction you get it. Ethereum can guarantee the loan and repayment succeeds so the borrower really can loan $1 billion. Of course this only works as long as whatever tool the loan contract is using to check that the borrower can repay $1 billion works. If not then the money is going to be stolen...

As for goal, there isn't one. Its whatever folks want it to be and a large number think ponzis are the goal...

As for normal currency, it does not need to be stable. See Venezuela as recent example. It typically can't follow a real currency like USD exactly. In fact trying to keep an exchange rate between a strong currency and something else the same almost always ends horrifically like https://en.wikipedia.org/wiki/Black_Wednesday